Detection of triacetone triperoxide using temperature cycled metal‐oxide semiconductor gas sensors

Abstract

The temperature‐dependent sensing properties of metal‐oxide semiconductor gas sensors (MOX), based on SnO2 and WO3, to measure triacetone triperoxide (TATP), diacetone diperoxid (DADP), and di‐tert‐butyl‐peroxide (DTBP) and acetone are described. Conductivity measurements in the range from 100 to 400 °C operating temperature show two different reaction pathways on the surface for WO3 sensors. At temperatures below 150 °C organic peroxides react as an oxidizer which leads to an increase in the sensor resistance. Above 200 °C they react as a reducing agent that leads to a decrease of the sensor resistance. This effect is caused by two different, peroxide dependent reaction paths. The unique behavior of WO3‐based sensors can be used for selectivity enhancements in temperature cycle operation mode. With this method gas concentrations down to a few ppb are detectable. Scheme of TATP reacting on tungsten oxide semiconductor gas sensor. TATP decomposes and this leads to an increase of the sensor resistance at low temperatures and a decrease of resistance at high temperatures.

A Sensor Array Realized by a Single Flexible TiO2/POMs Film to Contactless Detection of Triacetone Triperoxide

“…Therefore, the development of sensor devices for explosive detection has great potential. As shown in Table S1 , a few technologies, such as ion mobility spectrometry (IMS) [ 3 , 4 ], electrochemical method [ 5 , 6 ], colorimetric sensor [ 7 , 8 ] and gas sensing sensors [ 9 , 10 , 11 , 12 ], have been discovered in the field of trace TATP detection. IMS converts trace vapor into ions at atmospheric pressure and characterizes the gas phase mobility of these ions in a weak electric field to offer a highly efficient response to trace gas or vapor species.…”

Recent Developments in the Field of Explosive Trace Detection

“…An LOD in the ppb range is reported. 115 An E-nose using silicon nanowire field effect transistors (SiNW-FETs) has been developed by Tracense Systems. Chemically modified silicon nanowire arrays provide selective binding of nitro-containing and peroxide-based explosives, with detection achieved through measuring the change in conductance on adsorption of explosives.…”

Peroxide Based Organic Explosives

“…Of course using electrochemical detection of TATP precursors is not a new concept [87,[115][116][117]]. Dobrokhotov's [118] team introduced a good response with nano-spring-based sensors for gases such as TATP precursors, as well as determining conditions for In 2 O 3 [119] and WO 3 [120] but still did not achieve operation at room temperature. The application of graphene in chemical gas sensors is receiving more and more attention [121,122].…”