Surface-enhanced Raman scattering on nanodiamond-derived carbon onions

作     者：Ying Song Zongwei Xu Andreas Rosenkranz Mathias Rommel Changkun Shi Fengzhou Fang 

作者机构：State Key Laboratory of Precision Measuring Technology & Instruments Centre of MicroNano Manufacturing Technology Tianjin University Department of Chemical Engineering Biotechnology and Materials Universidad de Chile Fraunhofer Institute for Integrated Systems and Device Technology (IISB) 

出 版 物：《Nanotechnology and Precision Engineering》 (纳米技术与精密工程（英文）)

年 卷 期：2019年第2卷第1期

页      面：35-39页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by National Natural Science Foundation of China (No. 51575389, 51761135106, 51511130074) National Key Research and Development Program of China (2016YFB1102203) State key laboratory of precision measuring technology and instruments (Pilt1705) 

主　　题：Nanodiamonds Carbon onions Surface-enhanced Raman scattering LOPC mode 

摘      要：Annealing nanodiamonds(ND) at high temperatures up to 1700 ℃ is a common method to synthesize carbon onions. The transformation from NDs to carbon onions is particularly interesting because of carbon onions potential in the field of tribology and their application in ultra-charge/discharge devices. In this paper, a novel surface-enhanced Raman scattering technique that involves coating the sample with nanoscopic gold particles is proposed to characterize the NDs after different annealing treatments. Conventional Raman and surfaceenhanced Raman spectra were obtained, and the changes of peak parameters as the function of annealing temperature were evaluated. It was found that the widths of the D and the G peaks decreased with increasing annealing temperature, reflecting an improved order in the sp^2-hybridized carbon during the transformation from NDs to carbon onions. After annealing at 1700 ℃, the sp^2?carbon was highly ordered, indicating desirable electrical conductivity and lubricity. With increasing annealing temperature, the D peak showed a blue shift of almost30 cm^(-1), while the G peak merely shifted by 5 cm^(-1). For annealing temperatures above 1100 ℃, an increase of intensity ratio ID/IGwas observed. Compared to the uncoated area, red shifts of 0.5-2 cm^(-1) and of 5-9 cm^(-1) for the G and D peaks, respectively, were detected for the gold-coated area, which was due to the coupling of the plasmons and the phonons of the samples.