Email: a.bettiol@nus.edu.sg
Office: S12-03-13
Tel: +65 6516 4138
Current Research
Dr Bettiol’s research focuses on the use of highly focused high energy mega-electron-volt ion beams, such as protons and alpha particles, for the modification of materials and biological cells.
Using the highly focused ion beams, quantum defects are created in diamond, SiC and 2D materials such as hBN. We develop technologies for deterministically creating single photon emitters and other spin defects in these materials for quantum sensing applications.
The high energy focused ion beams are also used to study radiobiology. We have developed a high resolution cell targeting system for delivering a quantitative dose of single protons with a targeting accuracy of less than 1 micron. Using these beams we are able to study DNA damage and other biological processes such as the bystander effect.
Selected Publications
- Shihao Ru, Zhengzhi Jiang, Haidong Liang, Jonathan Kenny, Hongbing Cai, Xiaodan Lyu, Robert Cernansky, Feifei Zhou, Yuzhe Yang, Kenji Watanabe, Takashi Taniguch, Fuli Li, Teck Seng Koh, Xiaogang Liu, Fedor Jelezko, Andrew A. Bettiol, and Weibo Gao. Robust nuclear spin polarization via ground-state level anticrossing of boron vacancy defects in hexagonal boron nitride. Physical Review Letters, 132:266801, JUN 2024. doi:10.1103/PhysRevLett.132.266801.
- Zhaohong Mi, Hongyu Bian, Chengyuan Yang, Yanxin Dou, Andrew A. Bettiol, and Xiaogang Liu. Real-time single proton counting with transmissive perovskite nanocrystal scintillators. Nature Materials, 23:803–809, JAN 2024. doi:10.1038/s41563-023-01782-z.
- Yuan Chen, Haidong Liang, Leyi Loh, Yiwei Ho, Ivan Verzhbitskiy, Kenji Watanabe, Takashi Taniguchi, Michel Bosman, Andrew A. Bettiol, and Goki Eda. Gate-tunable bound exciton manifolds in monolayer MoSe2. Nano Letters, 23(10):4456–4463, MAY 2023. doi:10.1021/acs.nanolett.3c00814.
- Haidong Liang, Yuan Chen, Changyuan Yang, Kenji Watanabe, Takashi Taniguchi, Goki Eda, and Andrew A. Bettiol. High sensitivity spin defects in hBN created by high-energy he beam irradiation. Advanced Optical Materials, 11(1):2201941, JAN 2023. doi:10.1002/adom.202201941.
- Chengyuan Yang, Zhaohong Mi, Huining Jin, Thirumalai Venkatesan, Ratnakar Vispute, and Andrew Bettiol. Large-scale fabrication of surface SiV− centers in a flexible diamond membrane. Carbon, 203:842–846, JAN 2023. doi:10.1016/j.carbon.2022.12.031.
- Haidong Liang, Yue Zheng, Zehua Hu Leyi Loh, Qijie Liang, Cheng Han, Michel Bosman, Wei Chen, and Andrew A. Bettiol. Robust n-type doping of WSe2 enabled by controllable proton irradiation. Nano Research, 16(1):1220–1227, JAN 2023. doi:10.1007/s12274-022-4668-9.
- Feifei Zhou, Zhengzhi Jiang, Haidong Liang, Shihao Ru, Andrew A. Bettiol, and Weibo Gao. Dc magnetic field sensitivity optimization of spin defects in hexagonal boron nitride. Nano Letters, 23(13):6209–6215, JUN 2023. doi:10.1021/acs.nanolett.3c01881.
- Zhepeng Zhang, Haidong Liang, Leyi Loh, Yifeng Chen, Yuan Chen, Kenji Watanabe, Takashi Taniguchi, Su Ying Quek, Michel Bosman, Andrew A. Bettiol, and Goki Eda. Optically active chalcogen vacancies in monolayer semiconductors. Advanced Optical Materials, 10(23):2201350, DEC 2022. doi:10.1002/adom.202201350.
- Zhaohong Mi, Ce-Belle Chen, Hong Qi Tan, Yanxin Dou, Chengyuan Yang, Shuvan Prashant Turaga, Minqin Ren, Saumitra K. Vajandar, Gin Hao Yuen, Thomas Osipowicz, Frank Watt, and Andrew A. Bettiol. Quantifying nanodiamonds biodistribution in whole cells with correlative iononanoscopy. Nature Communications, 12(1):4657, AUG 2021. doi:10.1038/s41467-021-25004-9.
- Andrew A. Bettiol, Zhaohong Mi, and Frank Watt. High-resolution fast ion microscopy of single whole biological cells. Applied Physics Reviews, 3(4):041102, DEC 2016. doi:10.1063/1.4971414.