Chong Wei Tan
Nanyang Technological University
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Publication
Featured researches published by Chong Wei Tan.
Nanoscale Research Letters | 2012
Xiaocheng Li; Beng Kang Tay; Junshuai Li; Dunlin Tan; Chong Wei Tan; Kun Liang
Large-area mildly reduced graphene oxide (MR-GO) monolayer films were self-assembled on SiO2/Si surfaces via an amidation reaction strategy. With the MR-GO as templates, MR-GO-Ag nanoparticle (MR-GO-Ag NP) hybrid films were synthesized by immersing the MR-GO monolayer into a silver salt solution with sodium citrate as a reducing agent under UV illumination. SEM image indicated that Ag NPs with small interparticle gap are uniformly distributed on the MR-GO monolayer. Raman spectra demonstrated that the MR-GO monolayer beneath the Ag NPs can effectively quench the fluorescence signal emitted from the Ag films and dye molecules under laser excitation, resulting in a chemical enhancement (CM). The Ag NPs with narrow gap provided numerous hot spots, which are closely related with electromagnetic mechanism (EM), and were believed to remarkably enhance the Raman signal of the molecules. Due to the co-contribution of the CM and EM effects as well as the coordination mechanism between the MR-GO and Ag NPs, the MR-GO-Ag NP hybrid films showed more excellent Raman signal enhancement performance than that of either Ag films or MR-GO monolayer alone. This will further enrich the application of surface-enhanced Raman scattering in molecule detection.
ACS Omega | 2017
Yu Dian Lim; Alexander Vasiliyvich Avramchuck; Dmitry Grapov; Chong Wei Tan; Beng Kang Tay; Sheel Aditya; Vladimir Labunov
Tall, crystalline carbon nanotubes (CNTs) are desired to successfully integrate them in various applications. As the crystallinity of CNTs improves with increasing growth temperatures, higher growth temperatures are required to obtain crystalline CNTs. However, in a typical chemical vapor deposition (CVD) process, CNT growth rate reduces when the growth temperature exceeds a specific level due to the degradation of the catalyst particles. In this study, we have demonstrated the improved catalytic activity of nickel/ferrocene-hybridized catalyst as compared to sole ferrocene catalyst. To demonstrate this, CNTs are grown on bare silicon (Si) as well as nickel (Ni) catalyst-deposited substrates using volatile catalyst source (ferrocene/xylene) CVD at the growth temperatures ranging from 790 to 880 °C. It was found that CNTs grown on bare Si substrate experience a reduction in height at growth temperature above 860 °C, whereas the CNTs grown on 10 nm Ni catalyst-deposited substrates experience continuous increase in height as the temperature increases from 790 to 880 °C. The enhancement in the height of CNTs by the addition of Ni catalyst is also demonstrated on 5, 20, and 30 nm Ni layers. The examination of CNTs using electron microscopy and Raman spectra shows that the additional Ni catalyst source improves the CNT growth rates and crystallinity, yielding taller CNTs with a high degree of structural crystallinity.
Diamond and Related Materials | 2011
Chong Wei Tan; Shakerzadeh Maziar; Edwin Hang Tong Teo; Beng Kang Tay
Carbon | 2018
Qinyu Kong; Laurence Bodelot; Bérengère Lebental; Yu Dian Lim; Li Lynn Shiau; Boris Gusarov; Chong Wei Tan; Kun Liang; Congxiang Lu; Chuan Seng Tan; Philippe Coquet; Beng Kang Tay
Applied Surface Science | 2014
Congxiang Lu; Wenwen Liu; Xingli Wang; Xiaocheng Li; Chong Wei Tan; Beng Kang Tay; Philippe Coquet
Surface & Coatings Technology | 2018
Qinyu Kong; Lin Qiu; Yu Dian Lim; Chong Wei Tan; Kun Liang; Congxiang Lu; Beng Kang Tay
IEEE Transactions on Electron Devices | 2018
Boris Vaisband; Ange Maurice; Chong Wei Tan; Beng Kang Tay; Eby G. Friedman
electronics packaging technology conference | 2017
Ye Zhu; Chong Wei Tan; Shen Lin Chua; Yu Dian Lim; Beng Kang Tay; Chuan Seng Tan
Applied Surface Science | 2017
Yu Dian Lim; Qinyu Kong; Shaomeng Wang; Chong Wei Tan; Beng Kang Tay; Sheel Aditya
E-MRS Spring Meeting | 2014
Loïc Loisiel; Bérengère Lebental; M. K. Samani; Chong Wei Tan; Costel Sorin Cojocaru; Dominique Baillargeat; Beng Kang Tay