期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 11, 页码 8387-8395出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501291d
关键词
surface-enhanced Raman spectroscopy; surface-assisted laser desorption/ionization mass spectrometry; titania nanotubes; gold
资金
- Strategic Project to Support the Formation of Research Bases at Private Universities, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Japan Society for the Promotion of Science (JSPS) [23360361, 23655074, 22350040]
- Network Joint Research Center for Materials and Devices [2013A20]
In this report, we demonstrate gold-decorated titania nanotube arrays (Au-TNA substrate) as a dual-functional platform for surface-enhanced Raman spectroscopy (SERS) and surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS). The Au nanopartides are grown on the substrate using vapor deposition of Au. The resulting substrates perform better than Au colloids in terms of the reproducibility of the SEAS measurements, long-term stability of the fabricated structures, and clean surface of the Au. The nanostructure of the Au-TNA substrate was designed to optimize the SALDI-MS and SERS performance. Excellent reproducibility of the SERS measurements using the Au-TNA substrate was obtained, with a standard error less than 6 %. SALDI activity was also demonstrated for the same Au-TNA substrates. Finally, the Au-TNA substrate was used for combined SERS and SALDI-MS analysis (i) to discriminate the structural isomers of pyridine compounds (para-, meta-, and ortho-pyridinecarboxylic acid) and (ii) to detect polycarbamate, a dithiocarbamate fungicide. These results are difficult to obtain using either approach alone.
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