1. Laser induced popcornlike conformational transition of nanodiamond as a nanoknife.
- Author
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Chia-Ching Chang, Pei-Hsin Chen, Hsueh-Liang Chu, Tzu-Cheng Lee, Ching-Chung Chou, Jui-I Chao, Chien-Ying Su, Jyh Shin Chen, Jin-Sheng Tsai, Chuan-Mei Tsai, Yen-Peng Ho, Kien Wen Sun, Chia-Liang Cheng, and Fu-Rong Chen
- Subjects
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RADIATIVE transitions , *NANODIAMONDS , *NANOSTRUCTURED materials , *SPECTRUM analysis , *GRAPHITE , *LASERS - Abstract
Nanodiamond (ND) is surrounded by layers of graphite on its surface. This unique structure feature creates unusual fluorescence spectra, which can be used as an indicator to monitor its surface modification. Meanwhile, the impurity, nitroso (C[Single_Bond]N==O) inside the ND can be photolyzed by two-photon absorption, releasing NO to facilitate the formation of a sp3 diamond structure in the core of ND and transforming it into a sp2 graphite structure. Such a conformational transition enlarges the size of ND from 8 to 90 nm, resulting in a popcornlike structure. This transition reaction may be useful as nanoknives in biomedical application. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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