Surface-enhanced Raman spectroscopy for characterization of nanodiamond seeded substrates and ultrananocrystalline diamond at the early-stage of plasma CVD growth process

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• 作者：S.-T. Chen^a ; Y.-C. Chu^a ; C.-Y. Liu^b ; ^c ; C.-H. Huang^a ; Y. Tzeng^a ; ^b ; ^{tzengyo@mail.ncku.edu.tw}
• 关键词：UNCD ; AAO ; SERS ; Silver nanoparticles
• 刊名：Diamond and Related Materials
• 出版年：2012
• 期刊代码：30_09259635
• 类别：ms
• 出版时间：April, 2012
• 卷：24
• 期：Complete
• 页码：161-166
• 文件大小：1026 K

摘要

Nanodiamond seeds on substrates and ultrananocrystalline diamond (UNCD) at the early-stage of CVD have been characterized by surface-enhanced Raman spectroscopy (SERS). Anodic aluminum oxide (AAO) films encapsulated with two-dimensional arrays of silver nanoparticles are used as the substrates. UNCD is grown by 400 W, 2.45 GHz microwave plasma CVD using detonation nanodiamond as seeds in a gas mixture of 1%methane diluted by 99%argon at the substrate temperature of 400 掳C and gas pressure of 100 Torr for 15-45 min. Light illumination on Ag nanoparticles induces strong plasmonic coupled local electromagnetic fields for enhancing Raman scattering signals from nanodiamond seeds and UNCD films on AAO substrates at the early-stage of CVD. With electrodeposited silver nanoparticles photoluminescence signal is suppressed for revealing weak Raman signals. Fabrication of the Ag/AAO SERS substrates and the SERS spectra for nanodiamond seeded AAO substrates and ultra-thin UNCD at the early-stage of CVD growth are discussed.