Scatter-Free IR Absorption Spectra of Individual, 3鈥? 渭m, Airborne Dust Particles Using Plasmonic Metal Microarrays: A Library of 63 Spectra
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- 作者：Katherine E. Cilwa ; Matthew McCormack ; Michelle Lew ; Christophe Robitaille ; Lloyd Corwin ; Marvin A. Malone ; James V. Coe
- 刊名：Journal of Physical Chemistry C
- 出版年：2011
- 出版时间：September 1, 2011
- 年：2011
- 卷：115
- 期：34
- 页码：16910-16919
- 全文大小：1115K
- 年卷期：v.115,no.34(September 1, 2011)
- ISSN：1932-7455
文摘
While the concentration of airborne particulate matter is well-known to be correlated with people鈥檚 health, a chemical evaluation must also be important. Noting that airborne dust particles in the 3鈥? 渭m size regime are among the largest that get into people鈥檚 lungs, such particles were collected by pumping air through plasmonic metal films with a 12.6 渭m square lattice of 5 渭m square holes. Capture of a dust particle in a metallic hole enables the recording of 鈥渟catter-free鈥?infrared absorption spectra whose peaks reveal the infrared active components. The study of the spectra of individual particles allows minority components to be characterized in a way that is quite incisive which is difficult with bulk samples. A library of 63 spectra of individual particles captured from our laboratory air is presented along with a preliminary analysis of the contributing components.