Reflectance-based detection of oxidizers in ambient air

Abstract

a b s t r a c tThis study used two types of paper supported materials with a prototype, reflectance-based detector for indication of hydrogen peroxide vapor under ambient laboratory conditions. Titanyl based indicators provide detection through reaction of the indicator resulting in a dosimeter type sensor, while porphyrin based indicators provide a reversible interaction more suitable to continuous monitoring applications. These indicators provide the basis for discussion of characteristics important to design of a sensor system including the application environment and duration, desired reporting frequency, and target specificity.Published by Elsevier B.V.

Development of a Detection Algorithm for Use with Reflectance-Based, Real-Time Chemical Sensing

“…PT3 is an early version of the prototype under development (Supplementary Materials, Figure S1). It was primarily designed to provide a system for screening of multiple indicator materials simultaneously, and it has been described in previous publications [2,3]. Details for this prototype are provided in the Supplementary Materials.…”

“…Silver chloride (CAS 7783-90-6) was obtained from Sigma-Aldrich (St. Louis, MO, USA). The metalloporphyrin construct, AgN 4 TPP, used for collection of all data reported here, was prepared by reflux as previously reported [2,3,20]. Paper supported porphyrin indicator was prepared using a dip and dry technique.…”

“…Samples were then dried at 100 °C before storing in the dark in sealed plastic bags. This procedure has been described previously for preparation of the indicator materials [2,3]. …”

“…The first type was utilized with only the PT3 prototype [2,3]. Porphyrin indicators were first measured over empty Petri dishes (60 mm diameter).…”

“…Tracking of reflectance based color changes can be accomplished using low cost, commercially available sensor chips. We have previously reported on indicator behavior and initial prototype devices [2,3]. …”