期刊
NANO LETTERS
卷 11, 期 8, 页码 3169-3173出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201385p
关键词
Porous silicon; nanomaterials; chemical sensor; chromatography; photonic crystal; volatile organic compounds
类别
资金
- National Science Foundation [DMR-0806859]
- Tyco Electronics
- Natural Sciences and Engineering Research Council of Canada (NSERC)
Microsensors for gas-phase analytes are fundamentally limited by their inability to discriminate between analytes. While cross-reactive arrays consisting of multiple different sensor elements provide one means to identify individual analytes, these artificial nose devices rely on complicated data processing algorithms and they generally suffer from significant zero-point drift. Herein, we present a single component optical sensor that is capable of identifying chemical compounds at parts-per-million concentrations. The device consists of a stack of three mesoporous silicon-based photonic crystals; a porous drift tube is sandwiched between two optically responsive layers. The drift layer temporally separates the optical responses of the other layers, and this difference is shown to be characteristic of the analyte.
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