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ACS Appl Mater Interfaces

Title:		Spherical porphyrin sensor array based on encoded colloidal crystal beads for VOC vapor detection
Author(s):		Xu H; Cao KD; Ding HB; Zhong QF; Gu HC; Xie ZY; Zhao YJ; Gu ZZ;
Address:		"State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Si Pai Lou 2, Nanjing 210096, China"
Journal Title:		ACS Appl Mater Interfaces
Year:		2012
Volume:		20121128
Issue:		12
Page Number:		6752 - 6757
DOI:		10.1021/am3019383
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"A spherical porphyrin sensor array using colloidal crystal beads (CCBs) as the encoding microcarriers has been developed for VOC vapor detection. Six different porphyrins were coated onto the CCBs with distinctive encoded reflection peaks via physical adsorption and the sensor array was fabricated by placing the prepared porphyrin-modified CCBs together. The change in fluorescence color of the porphyrin-modified CCBs array serves as the detection signal for discriminating between different VOC vapors and the reflection peak of the CCBs serves as the encoding signal to distinguish between different sensors. It was demonstrated that the VOC vapors detection using the prepared sensor array showed excellent discrimination: not only could the compounds from the different chemical classes be easily differentiated (e.g., alcohol vs acids vs ketones) but similar compounds from the same chemical family (e.g., methanol vs ethanol) and the same compound with different concentration ((e.g., Sat. ethanol vs 60 ppm ethanol vs 10 ppm ethanol) could also be distinguished. The detection reproducibility and the humidity effect were also investigated. The present spherical sensor array, with its simple preparation, rapid response, high sensitivity, reproducibility, and humidity insensitivity, and especially with stable and high-throughput encoding, is promising for real applications in artificial olfactory systems"
Keywords:		*Colloids Crystallization Porphyrins/*analysis Volatile Organic Compounds/*analysis;
Notes:		"MedlineXu, Hua Cao, Kai-Di Ding, Hai-Bo Zhong, Qi-Feng Gu, Hong-Cheng Xie, Zhuo-Ying Zhao, Yuan-Jin Gu, Zhong-Ze eng Research Support, Non-U.S. Gov't 2012/11/21 ACS Appl Mater Interfaces. 2012 Dec; 4(12):6752-7. doi: 10.1021/am3019383. Epub 2012 Nov 28"