Professor Yusuke Yamauchi
Professor

Yusuke Yamauchi

Email: 
Phone: 
+61 7 344 31144

Background

Professor Yusuke Yamauchi received his Bachelor's degree (2003), Master's degree (2004), and Ph.D. degree (2007) from Waseda University, Japan. After receiving his Ph.D., he joined the National Institute of Materials Science (NIMS) in Japan, to start his own research group. At the same time, he began to serve as an adjunct professor to supervise Ph.D. students at the Department of Nanoscience and Nanoengineering, Waseda University. After being granted the ARC Future Fellowship, in May 2016, he joined the Institute for Superconducting & Electronic Materials (ISEM), the Australian Institute for Innovative Materials (AIIM) at the University of Wollongong (UOW) as a Professor. In 2017, he moved to the University of Queensland (UQ). Presently, he is a Senior Group Leader at the Australian Institute for Bioengineering and Nanotechnology (AIBN) (on secondment from the School of Chemical Engineering until 2026), a Professor at the School of Chemical Engineering, and a Director at the Australian Materials nanoTectonics Centre, UQ. He concurrently serves as an ERATO Research Director at the JST-ERATO Yamauchi Materials Space-Tectonics, a Distinguished Professor at Nagoya University (Japan), an Honorary Distinguished Professor at Yonsei University (South Korea), an Invited Researcher at the National Institute for Materials Science (NIMS), a Guest Senior Researcher (Guest Professor) at Waseda University, an Advisory Board Member of prestigious journals (Small, Small Structures, Precision Chemistry, ChemCatChem, J. Inorg. Organomet. Polym. Mater., etc.) and an Associate Editor of the Journal of Materials Chemistry A published by the Royal Society of Chemistry (RSC) and Chemical Engineering Journal (Elsevier).

He has published more than 900 papers in international refereed journals (>10 Nature's and Science's sister journals, >1 Proceedings of the National Academy of Sciences of the United States of America, >1 Chemical Reviews, >26 J Am Chem Soc (ACS), >18 ACS Nano (ACS), >28 Chem Mater (ACS), >3 Chemical Society Reviews (RSC), >17 Chem Sci (RSC), >13 Mater Hor (RSC), >58 Chem Commun (RSC), >20 Bull Chem Soc Jpn (CSJ), >20 Chem Lett (CSJ), >20 Adv Mater (Wiley), >35 Angew Chem Int Ed (Wiley), >30 Small (Wiley), etc.) with >70,000 Times Cited (h-index >137, Google Scholar; h-index >128, Web-of-Science). He was selected as one of the Highly-Cited Researchers in Chemistry in 2016, 2017, 2018, 2019, 2020, 2021, and 2022 and in Materials Science in 2020, 2021, and 2022. He has received many outstanding awards, such as the NISTEP Award from the National Institute of Science and Technology Policy (2016), the Chemical Society of Japan (CSJ) Award for Young Chemists (2014), the Young Scientists' Prize of the Commendation for Science and Technology by MEXT (2013), the PCCP Prize by the Royal Society of Chemistry (2013), the Tsukuba Encouragement Prize (2012), the Ceramic Society of Japan (CerSJ) Award (2010), and the Inoue Research Award for Young Scientists (2010). Recently, he was selected as one of Australia's Top 40 Researchers of Research Report published by The Australian in 2019, 2020, and 2021.

AIBN: https://aibn.uq.edu.au/yamauchi

Yamauchi's publications

Google Scholar: https://scholar.google.com.au/citations?user=568w7h8AAAAJ&hl=en

Researcher ID: http://www.researcherid.com/rid/D-2780-2015

Availability

Professor Yusuke Yamauchi is:
Available for supervision

Qualifications

  • Bachelor of Engineering, Waseda University
  • Masters (Coursework) of Engineering, Waseda University
  • Doctoral Diploma of Engineering, Waseda University

Research impacts

Professor Yusuke Yamauchi specialises in the design of exotic nanospaces in inorganic materials with controlled compositions and morphologies toward practical applications. Yamauchi Group creates novel “inorganic nanosolids containing internal nanospaces, as unprecedented nanospace materials, and develop several methodologies for their effective integration with the aim of exploiting functions obtained based on the synergistic fusion of various supramolecular, photonic, and magnetic behaviors occurring in nanospace. The research area will cover a wide range of various porous systems such as metals, carbons, sulfides, phosphides, transition metal oxides, etc. The group will efficiently combine ‘machine learning’ with our inorganic synthesis methods to accelerate the optimization of synthetic parameters for the design of target materials, and to select proper patterns of the combination of each inorganic block for the integration of materials.

An architect can design houses and buildings, while a nano-architect can design materials. We are always targetting THE WORLD-FIRST game-changing materials. - See the details; Yamauchi Y. (2019) Nano-architect (Nature Index 2019). Nature 567, S12.

Search Professor Yusuke Yamauchi’s works on UQ eSpace

1287 works between 2004 and 2025
All (1287) Journal Article (1269) Book Chapter (1) Conference Publication (14) Book (2) Other Outputs (1)

581 - 600 of 1287 works

2019

Journal Article

Auto-programmed heteroarchitecturing: self-assembling ordered mesoporous carbon between two-dimensional Ti3C2Tx MXene layers

Allah, Abeer Enaiet, Wang, Jie, Kaneti, Yusuf Valentino, Li, Tao, Farghali, Ahmed A., Khedr, Mohamed Hamdy, Nanjundan, Ashok Kumar, Ding, Bing, Dou, Hui, Zhang, Xiaogang, Yoshio, Bando and Yamauchi, Yusuke (2019). Auto-programmed heteroarchitecturing: self-assembling ordered mesoporous carbon between two-dimensional Ti3C2Tx MXene layers. Nano Energy, 65 103991, 103991. doi: 10.1016/j.nanoen.2019.103991

Auto-programmed heteroarchitecturing: self-assembling ordered mesoporous carbon between two-dimensional Ti3C2Tx MXene layers

2019

Journal Article

Gold nanoparticles anchored on mesoporous zirconia thin films for efficient catalytic oxidation of carbon monoxide at low temperatures

Zakaria, Mohamed B., Malgras, Victor, Nagata, Takahiro, Kim, Jeonghun, Bando, Yoshio, Fatehmulla, Amanullah, Aldhafiri, Abdullah M., Farooq, W. Aslam, Jikihara, Yohei, Nakayama, Tsuruo, Yamauchi, Yusuke and Lin, Jianjian (2019). Gold nanoparticles anchored on mesoporous zirconia thin films for efficient catalytic oxidation of carbon monoxide at low temperatures. Microporous and Mesoporous Materials, 288 109530, 109530. doi: 10.1016/j.micromeso.2019.05.055

Gold nanoparticles anchored on mesoporous zirconia thin films for efficient catalytic oxidation of carbon monoxide at low temperatures

2019

Journal Article

High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method

Li, Yang, Xie, Huaqing, Li, Jing, Bando, Yoshio, Yamauchi, Yusuke and Henzie, Joel (2019). High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method. Carbon, 152, 688-696. doi: 10.1016/j.carbon.2019.06.050

High performance nanoporous carbon microsupercapacitors generated by a solvent-free MOF-CVD method

2019

Journal Article

Mesoscopic architectures made of electrically charged binary colloidal nanosheets in aqueous system

Nakato, Teruyuki, Takahashi, Atsushi, Terada, Shinya, Yamaguchi, Shogo, Mouri, Emiko, Shintate, Morio, Yamamoto, Shinya, Yamauchi, Yusuke and Miyamoto, Nobuyoshi (2019). Mesoscopic architectures made of electrically charged binary colloidal nanosheets in aqueous system. Langmuir, 35 (45), 14543-14552. doi: 10.1021/acs.langmuir.9b02474

Mesoscopic architectures made of electrically charged binary colloidal nanosheets in aqueous system

2019

Journal Article

Designed patterning of mesoporous metal films based on electrochemical micelle assembly combined with lithographical techniques

Lim, Hyunsoo, Kim, Jeonghun, Kani, Kenya, Masud, Mostafa Kamal, Park, Hyeongyu, Kim, Minjun, Alsheri, Saad M., Ahamad, Tansir, Alhokbany, Norah, Na, Jongbeom, Malgras, Victor, Bando, Yoshio and Yamauchi, Yusuke (2019). Designed patterning of mesoporous metal films based on electrochemical micelle assembly combined with lithographical techniques. Small, 16 (12) 1902934, 1902934. doi: 10.1002/smll.201902934

Designed patterning of mesoporous metal films based on electrochemical micelle assembly combined with lithographical techniques

2019

Journal Article

Ultralong storage life of Li/MnO2 primary batteries using MnO2-(CFx)n with C–F semi-ionic bond as cathode materials

Chang, Yali, Wang, Min, Wang, Shengping, Na, Jongbeom, Bund, Andreas, Nanjundan, Ashok Kumar and Yamauchi, Yusuke (2019). Ultralong storage life of Li/MnO2 primary batteries using MnO2-(CFx)n with C–F semi-ionic bond as cathode materials. Electrochimica Acta, 320 134618, 134618. doi: 10.1016/j.electacta.2019.134618

Ultralong storage life of Li/MnO2 primary batteries using MnO2-(CFx)n with C–F semi-ionic bond as cathode materials

2019

Journal Article

Ultra-thin, highly graphitized carbon nanosheets into three-dimensional interconnected framework utilizing a ball mill mixing of precursors

Wang, Jie, Kim, Jeonghun, Ding, Bing, Kim, Jung Ho, Malgras, Victor, Young, Christine and Yamauchi, Yusuke (2019). Ultra-thin, highly graphitized carbon nanosheets into three-dimensional interconnected framework utilizing a ball mill mixing of precursors. Chemical Engineering Journal, 374, 1214-1220. doi: 10.1016/j.cej.2019.06.012

Ultra-thin, highly graphitized carbon nanosheets into three-dimensional interconnected framework utilizing a ball mill mixing of precursors

2019

Journal Article

Core-shell structured metal-organic framework-derived carbon with redox-active polydopamine nanothin film

Kim, Minjun, Lim, Hyunsoo, Wang, Chaohai, Kani, Kenya, Kwon, Goomin, You, Jungmok, Park, Hyeongyu, Ali Alshehri, Abdulmohsen, Gamaan Alghamidi, Yousef, Ahmad Alzahrani, Khalid, Na, Jongbeom, Li, Jiansheng, Yamauchi, Yusuke and Kim, Jeonghun (2019). Core-shell structured metal-organic framework-derived carbon with redox-active polydopamine nanothin film. Materials Letters, 253, 178-182. doi: 10.1016/j.matlet.2019.06.038

Core-shell structured metal-organic framework-derived carbon with redox-active polydopamine nanothin film

2019

Journal Article

Lyotropic liquid crystalline mesophases made of salt-acid-surfactant systems for the synthesis of novel mesoporous lithium metal phosphates

Uzunok, Işıl, Kim, Jeonghun, Çolak, Tuluhan O., Kim, Dae Sik, Kim, Hansu, Kim, Minjun, Yamauchi, Yusuke and Dag, Ömer (2019). Lyotropic liquid crystalline mesophases made of salt-acid-surfactant systems for the synthesis of novel mesoporous lithium metal phosphates. ChemPlusChem, 84 (10) cplu.201900435, 1544-1553. doi: 10.1002/cplu.201900435

Lyotropic liquid crystalline mesophases made of salt-acid-surfactant systems for the synthesis of novel mesoporous lithium metal phosphates

2019

Journal Article

Long-lived, transferred crystalline silicon carbide nanomembranes for implantable flexible electronics

Phan, Hoang-Phuon, Zhong, Yishan, Nguyen, Tuan-Khoa, Park, Yoonseok, Dinh, Toan, Song, Enming, Vadivelu, Raja Kumar, Masud, Mostafa Kamal, Li, Jinghua, Shiddiky, Muhammad J. A., Dao, Dzung, Yamauchi, Yusuke, Rogers, John A. and Nguyen, Nam-Trung (2019). Long-lived, transferred crystalline silicon carbide nanomembranes for implantable flexible electronics. ACS Nano, 13 (10), 11572-11581. doi: 10.1021/acsnano.9b05168

Long-lived, transferred crystalline silicon carbide nanomembranes for implantable flexible electronics

2019

Journal Article

Enhancement of thermoelectric properties of La-doped SrTiO3 bulk by introducing nanoscale porosity

Ahmed, Al Jumlat, Nazrul Islam, Sheik Md Kazi, Hossain, Ridwone, Kim, Jeonghun, Kim, Minjun, Billah, Motasim, Hossain, Md Shahriar A., Yamauchi, Yusuke and Wang, Xiaolin (2019). Enhancement of thermoelectric properties of La-doped SrTiO3 bulk by introducing nanoscale porosity. Royal Society Open Science, 6 (10) 190870, 1-9. doi: 10.1098/rsos.190870

Enhancement of thermoelectric properties of La-doped SrTiO3 bulk by introducing nanoscale porosity

2019

Journal Article

Solid/solid interfacial architecturing of solid polymer electrolyte-based all-solid-state lithium-sulfur batteries by atomic layer deposition

Fan, Zengjie, Ding, Bing, Zhang, Tengfei, Lin, Qingyang, Malgras, Victor, Wang, Jie, Dou, Hui, Zhang, Xiaogang and Yamauchi, Yusuke (2019). Solid/solid interfacial architecturing of solid polymer electrolyte-based all-solid-state lithium-sulfur batteries by atomic layer deposition. Small, 15 (46) 1903952, 1903952. doi: 10.1002/smll.201903952

Solid/solid interfacial architecturing of solid polymer electrolyte-based all-solid-state lithium-sulfur batteries by atomic layer deposition

2019

Journal Article

A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheet

Li, Yunqi, Liu, Yuwei, Li, Jing, Xiong, Danping, Chen, Xiran, Liu, Mingtao, Zhong, Zheng, Malgras, Victor, Bando, Yoshio, Yamauchi, Yusuke and Xu, Jun (2019). A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheet. Materials Horizons, 7 (2), 489-494. doi: 10.1039/c9mh01142k

A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheet

2019

Journal Article

Excess heat production by the pair annihilation of ionic vacancies in copper redox reactions

Miura, Makoto, Sugiyama, Atsushi, Oshikiri, Yoshinobu, Morimoto, Ryoichi, Mogi, Iwao, Miura, Miki, Takagi, Satoshi, Kim, Jeonghun, Yamauchi, Yusuke and Aogaki, Ryoichi (2019). Excess heat production by the pair annihilation of ionic vacancies in copper redox reactions. Scientific Reports, 9 (1) 13695, 13695. doi: 10.1038/s41598-019-49310-x

Excess heat production by the pair annihilation of ionic vacancies in copper redox reactions

2019

Journal Article

Template-oriented synthesis of hydroxyapatite nanoplates for 3D bone printing

Doustkhah, Esmail, Najafi Zare, Reza, Yamauchi, Yusuke, Taheri-Kafrani, Asghar, Mohtasham, Hamed, Esmat, Mohamed, Ide, Yusuke, Fukata, Naoki, Rostamnia, Sadegh, Sadeghi, Morteza H. and Assadi, M. Hussein N. (2019). Template-oriented synthesis of hydroxyapatite nanoplates for 3D bone printing. Journal of Materials Chemistry B, 7 (45), 7228-7234. doi: 10.1039/c9tb01436e

Template-oriented synthesis of hydroxyapatite nanoplates for 3D bone printing

2019

Journal Article

Nanoarchitectured peroxidase-mimetic nanozymes: mesoporous nanocrystalline α- or γ-iron oxide?

Masud, Mostafa Kamal, Kim, Jeonghun, Billah, Md. Motasim, Wood, Kathleen, Shiddiky, Mohammad J. A., Nguyen, Nam-Trung, Parsapur, Rajesh Kumar, Kaneti, Yusuf Valentino, Alshehri, Abdulmohsen Ali, Alghamidi, Yousef Gamaan, Alzahrani, Khalid Ahmed, Adharvanachari, Murugulla, Selvam, Parasuraman, Hossain, Md. Shahriar A. and Yamauchi, Yusuke (2019). Nanoarchitectured peroxidase-mimetic nanozymes: mesoporous nanocrystalline α- or γ-iron oxide?. Journal of Materials Chemistry B, 7 (35), 5412-5422. doi: 10.1039/c9tb00989b

Nanoarchitectured peroxidase-mimetic nanozymes: mesoporous nanocrystalline α- or γ-iron oxide?

2019

Journal Article

Defect‐rich graphene nanomesh produced by thermal exfoliation of metal–organic frameworks for the oxygen reduction reaction

Xia, Wei, Tang, Jing, Li, Jingjing, Zhang, Shuaihua, Wu, Kevin C.‐W., He, Jianping and Yamauchi, Yusuke (2019). Defect‐rich graphene nanomesh produced by thermal exfoliation of metal–organic frameworks for the oxygen reduction reaction. Angewandte Chemie, 131 (38), 13488-13493. doi: 10.1002/ange.201906870

Defect‐rich graphene nanomesh produced by thermal exfoliation of metal–organic frameworks for the oxygen reduction reaction

2019

Journal Article

Rational design of nanoporous MoS2/VS2 heteroarchitecture for ultrahigh performance ammonia sensors

Zhang, Shuaihua, Wang, Jiayu, Torad, Nagy L., Xia, Wei, Aslam, Muhammad Aamir, Kaneti, Yusuf Valentino, Hou, Zhufeng, Ding, Zejun, Da, Bo, Fatehmulla, Amanullah, Aldhafiri, Abdullah M., Farooq, Wazirzada Aslam, Tang, Jing, Bando, Yoshio and Yamauchi, Yusuke (2019). Rational design of nanoporous MoS2/VS2 heteroarchitecture for ultrahigh performance ammonia sensors. Small, 16 (12) 1901718, 1901718. doi: 10.1002/smll.201901718

Rational design of nanoporous MoS2/VS2 heteroarchitecture for ultrahigh performance ammonia sensors

2019

Journal Article

Graphene nanoarchitectonics: Recent advances in graphene-based electrocatalysts for hydrogen evolution reaction

Huang, Huajie, Yan, Minmin, Yang, Cuizhen, He, Haiyan, Jiang, Quanguo, Yang, Lu, Lu, Zhiyong, Sun, Ziqi, Xu, Xingtao, Bando, Yoshio and Yamauchi, Yusuke (2019). Graphene nanoarchitectonics: Recent advances in graphene-based electrocatalysts for hydrogen evolution reaction. Advanced Materials, 31 (48) 1903415, e1903415. doi: 10.1002/adma.201903415

Graphene nanoarchitectonics: Recent advances in graphene-based electrocatalysts for hydrogen evolution reaction

2019

Journal Article

Shape-controlled Pd nanocrystal–polyaniline heteronanostructures with modulated polyaniline thickness for efficient electrochemical ethanol oxidation

Kim, Heon Chul, Kim, Yena, Bando, Yoshio, Yamauchi, Yusuke and Hong, Jong Wook (2019). Shape-controlled Pd nanocrystal–polyaniline heteronanostructures with modulated polyaniline thickness for efficient electrochemical ethanol oxidation. Journal of Materials Chemistry A, 7 (38), 22029-22035. doi: 10.1039/c9ta08349a

Shape-controlled Pd nanocrystal–polyaniline heteronanostructures with modulated polyaniline thickness for efficient electrochemical ethanol oxidation

Current funding

  • 2025 - 2028
    Early Detection and Treatment of Epithelial Carcinomas with a Micro-Endoscopic Soft Robot (NHMRC Ideas Grant administered by the University of New South Wales)
    University of New South Wales
    Open grant
  • 2025 - 2028
    Early Detection and Treatment of Epithelial Carcinomas with a Micro-Endoscopic Soft Robot
    University of New South Wales
    Open grant
  • 2025
    High speed multi modal in-situ TEM platform (ARC LIEF grant administered by QUT)
    Queensland University of Technology
    Open grant
  • 2024 - 2027
    Porous Two-Dimensional Inorganic Semiconductors for Optoelectronic Devices
    ARC Discovery Projects
    Open grant
  • 2024 - 2026
    Development of Nanoarchitectured Metal Nanoparticles for High Performance SERS device
    King Saud University
    Open grant
  • 2024 - 2027
    A next generation 'smart' superconducting magnet system in persistent mode
    ARC Linkage Projects
    Open grant
  • 2024 - 2027
    Converting Biomass into Value-Added Catalysts for Water Electrolysis
    ARC Linkage Projects
    Open grant
  • 2024 - 2029
    Materials Nanotectonics: Designing Conductive Inorganic Porous Materials
    ARC Australian Laureate Fellowships
    Open grant
  • 2024 - 2026
    Nagoya University - The University of Queensland: Collaborative Research and Academic Agreement Initiative
    Tokai National Higher Education and Research System Nagoya University
    Open grant
  • 2024 - 2025
    Characterizations of nanomaterials
    King Saud University
    Open grant
  • 2023 - 2025
    Integrated high-throughput material synthesis and characterisation system
    ARC Linkage Infrastructure, Equipment and Facilities
    Open grant
  • 2023 - 2025
    International Joint Research Project with Yonsei University
    Open grant
  • 2021 - 2025
    Low-cost, Lightweight and Liquid Helium-free Superconducting MRI Magnet
    ARC Linkage Projects
    Open grant
  • 2020 - 2026
    Ovarian cancer early detection, monitoring and therapeutic intervention using extracellular vesicles
    NHMRC MRFF EPCDR - Ovarian Cancer Research
    Open grant

Past funding

  • 2024
    Compositional analysis of nanomaterials
    King Saud University
    Open grant
  • 2023
    Characterization of nanostructured materials using advanced electron microscopy facilities at UQ
    King Saud University
    Open grant
  • 2023
    Characterizations of nanomaterials
    King Saud University
    Open grant
  • 2022 - 2023
    Development of Nanoarchitectured Electrodes for High Performance Energy Storage Device
    King Saud University
    Open grant
  • 2021 - 2025
    JST-ERATO Yamauchi Materials Space Tectonics
    Japan Science and Technology Agency
    Open grant
  • 2021 - 2023
    A customised triple-beam microscope for precise fabricating/characterising
    ARC Linkage Infrastructure, Equipment and Facilities
    Open grant
  • 2020 - 2021
    Development of spectroscopy-based sensor substrate for detection of drug and drug metabolite with integrated pretreatment
    Korea Institute of Industrial Technology
    Open grant
  • 2020 - 2022
    Nanoarchitectured anti-corrosive protection layer coating for zinc-plated steel sheets
    Baosteel-Australia Joint Research and Development
    Open grant
  • 2019 - 2023
    Functional biomass carbons for low-cost sodium and potassium-ion batteries
    ARC Linkage Projects
    Open grant
  • 2019 - 2020
    Converting Biomass into Value-Added Products Using Nanoporous Catalysts
    Global Connections Fund
    Open grant
  • 2019 - 2020
    Nanoarchitectured Functional Porous Materials as Adsorbents of Greenhouse Gases and Catalysts: Converting them into Valuable ... (Foundation for Australia-Japan Studies grant administered by UTokyo)
    University of Tokyo
    Open grant
  • 2019 - 2022
    Nanoarchitectured Multifunctional Porous Superparamagnetic Nanoparticles
    ARC Discovery Projects
    Open grant
  • 2019 - 2022
    Development of Nanoarchitectural Porous Electrode Materials for High Performance Energy Storage Systems
    Korean Institute of Materials Science
    Open grant
  • 2019 - 2021
    Controlled Release of Pharmaceutical Drug Delivery by Magnetic Fields
    Dr Macs Bio-Pharma Private Limited
    Open grant
  • 2019 - 2021
    IOT enabled and nano-engineered catalytic freshness preservation system
    PolTechCare Sdn Bhd
    Open grant
  • 2018 - 2022
    Nanostructure Engineered Low Activation Superconductors for Fusion Energy
    ARC Linkage Projects
    Open grant
  • 2018 - 2019
    Development of Lithium-Air Battery with 1,000 Wh/kg for Energy Storage System (ESS) to meet Environmental Regulations (Korean National R&D Program, KETEP / Dongguk University)
    Dongguk University
    Open grant
  • 2017 - 2020
    All-Metal Nanoprous Materials as Highly Active Electrocatalysts
    ARC Future Fellowships
    Open grant

Availability

Professor Yusuke Yamauchi is:
Available for supervision

Before you email them, read our advice on how to contact a supervisor.

Supervision history

Current supervision

Completed supervision

Enquiries

For media enquiries about Professor Yusuke Yamauchi's areas of expertise, story ideas and help finding experts, contact our Media team:

communications@uq.edu.au