期刊
NANO LETTERS
卷 16, 期 7, 页码 4641-4647出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01959
关键词
Nanoporous gold disks/nanoparticles; surface-enhanced near-infrared absorption spectroscopy; hydrocarbon sensing and identification; vibrational molecular overtones and combination bands; plasmonics; near-infrared molecular fingerprinting
类别
资金
- National Science Foundation (NSF) [CBET-1151154]
- Gulf of Mexico Research Initiative [GoMRI-030]
- U.S. Department of the Interior, Bureau of Safety and Environmental Enforcement [BSEE-1040]
Near-infrared (NIR) absorption spectroscopy provides molecular and chemical information based on overtones and combination bands of the fundamental vibrational modes in the infrared wavelengths. However, the sensitivity of NIR absorption measurement is limited by the generally weak absorption and the relatively poor detector performance compared to other wavelength ranges. To overcome these barriers, we have developed a novel technique to simultaneously obtain chemical and refractive index sensing in 1-2.5 mu m NIR wavelength range on nanoporous gold (NPG) disks, which feature high-density plasmonic hot-spots of localized electric field enhancement. For the first time, surface-enhanced near-infrared absorption (SENIRA) spectroscopy has been demonstrated for high sensitivity chemical detection. With a self-assembled monolayer (SAM) of octadecanethiol (ODT), an enhancement factor (EF) of up to similar to 10(4) has been demonstrated for the first C-H combination band at 2400 nm using NPG disk with 600 mn diameter. Together with localized surface plasmon resonance (LSPR) extinction spectroscopy, simultaneous sensing of sample refractive index has been achieved for the first time. The performance of this technique has been evaluated using various hydrocarbon compounds and crude oil samples.
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