Preoxidation for Colorimetric Sensor Array Detection of VOCs

Abstract

A disposable pre-oxidation technique is reported that dramatically improves the detection and identification of volatile organic compounds (VOCs) by a colorimetric sensor array. By passing a vapor stream through a tube packed with chromic acid on silica immediately before the colorimetric sensor array, the sensitivity to less reactive VOCs is substantially increased and limits of detection (LODs) are improved ~300-fold, permitting the detection, identification, and discrimination of 20 commonly found indoor VOC pollutants at both their immediately dangerous to life or health (IDLH) and at permissible exposure limits (PEL) concentrations. LODs of these pollutants were on average 1.4% of their respective PELs.

Multidimensional colorimetric sensor array for discrimination of proteins

“…The multidimensional devices generally require expensive instrumentation and highly skilled operators, which made them impractical for detection of analytes in the rural and underdeveloped areas. To overcome these drawbacks, colorimetric sensor arrays are extremely attractive because they can be easily read out by a simple UV À Vis absorption spectrophotometer or even with the naked eye (Askim et al, 2013;Feng et al, 2010;Janzen et al, 2006;Li et al, 2012;Lim et al, 2009;Lin et al, 2011;Musto et al, 2009;Rakow et al, 2005;Rakow and Suslick, 2000;Suslick et al, 2010;Yang et al, 2013). For example, Zhao et al designed simple colorimetric biosensors using of enzymatic cleavage of DNA on AuNPs for the detection of metal ions and sensing enzyme activities (Zhao et al, 2008).…”

Signal model of electronic noses with metal oxide semiconductor

“…Nevertheless, because electronic noses are sensitive, fast and easy to operate, researchers have attempted to apply them to many fields, such as disease diagnosis [5][6][7], the detection of explosives [8], and food safety control [9,10]. Electronic noses are expected to be a widely used tool in an increasing number of fields in the near future because their sensing system is essentially based on sensor array technologies, which have been widely studied in recent years [11][12][13]. Contrary to the substantial interest in developing various sensors, considerably less attention has been focused on a signal model for electronic noses.…”

Fiber-optic pulse width modulation sensor for low concentration VOC gas

“…: +82 53 9506829; fax: +82 53 9507932. colorimetric sensor technology such as the one described by Suslick et al useful information can be obtained about VOCs [9,10]. An improved colorimetric sensor using disposable preoxidation was reported by Hengwei Lin et al [11]. These sensors are known for their low cost, easy fabrication, non-requirement of light source or subsidiary circuits, and being able to monitor different VOC gases in real-time.…”