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Vapor Sensing: Organic Vapor Sensing Based on the Light Scattering Effect of Condensed Microdroplets (Small 24/2012)
Author(s) -
Zhang Haijuan,
Wang Xiaobo,
Wu Jianmin
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201290135
Subject(s) - dew point , dew , materials science , condensation , water vapor , scattering , light scattering , chemical physics , optics , optoelectronics , chemistry , thermodynamics , organic chemistry , physics
The image illustrates a natural phenomenon of droplet formation caused by the condensation of vapor on a nonwettable surface at temperature below the dew point. Real‐time observing the light scattered from the droplets may lead to a new mechanism for vapor sensing. However, the dew point of organic vapor in an air sample is usually far below room temperature. The problem has been solved by J. Wu and co‐workers using porous silicon infiltrated with ionic liquids, on which the organic vapor can be condensed into microdroplets at a temperature far above the dew point. This finding, described on page 3775 , leads to the creation of novel optical vapor sensor, which combines the light scattering effect of droplets with the sharp spectral features of pSi photonic crystal.