Fabrication of a one-dimensional tube-in-tube polypyrrole/tin oxide structure for highly sensitive DMMP sensor applications

Abstract

1D tube-in-tube polypyrrole/tin oxide structure was fabricated using electrospinning and vapor deposition polymerization to construct the DMMP gas sensor, which shows high sensitivity and selectivity.

HFIP‐Functionalized Co3O4 Micro‐Nano‐Octahedra/rGO as a Double‐Layer Sensing Material for Chemical Warfare Agents

“…To clarify the selectivity toward DMMP gas of the synthesized double‐layer sensing materials, sensors with rGO/Co 3 O 4 and rGO/Co 3 O 4 ‐HFIP sensing materials were tested with 0.5 ppm volatile organic compounds at 125 °C; the results are depicted in Figure c. As shown, the response of the rGO/Co 3 O 4 ‐HFIP sensor toward DMMP gas is double that of the other analytes and rGO/Co 3 O 4 . These observations confirm that the hydrogen‐bonding interactions between the rGO/Co 3 O 4 ‐HFIP and DMMP molecules greatly improved the selectivity toward DMMP gas as DMMP can generate hydrogen bonds because it has high polarity (3.62 D) and accepter groups (‐OCH 3 ) . Given the potential application, the responses of the rGO/Co 3 O 4 ‐HFIP sensor to DMMP with the presence of other interfering analytes was assessed, and the response values are presented in Figure d. Herein, in each test cycle, two types of gases were evaporated inside the gas chamber.…”

Gas sensors using ordered macroporous oxide nanostructures

“…2,3 Nowadays, the end use of gas sensors has been largely extended to various elds such as industrial, medical, automotive, petrochemical, military, and food safety. [4][5][6] According to a survey by Grand View Research Inc, the global gas sensor market was valued at USD 1.9 billion in 2017 and is anticipated to reach USD 3.4 billion by 2025; solid-state gas sensors share a major stake ($30%) of the sensor market. 7 Among the various type of sensors, semiconducting metal oxide (SMO) gas sensors as a class of chemiresistive solid-state sensors have gained considerable attention because of their real-time monitoring abilities, as well as other benets such as low cost, simple working principle, and good compatibility with Si processes.…”

Graphene chemiresistors modified with functionalized triphenylene for highly sensitive and selective detection of dimethyl methylphosphonate

“…The high sensitivity of nanomaterials is highly advantageous in detecting CWAs because CWAs are lethal even at low concentrations. The nerve agent sarin, for example, causes death within 10 min at 64 ppb; 11 various nanomaterials have been reported to detect the ppt-ppb level of dimethyl methylphosphonate (DMMP), [11][12][13] a simulant of sarin. As for the graphene, graphene oxide (GO), and reduced graphene oxide (rGO), however, the lowest DMMP concentration detected was only 5-25 ppm 14-17 even aer functionalization with polypyrrole (PPy), 15 single-stranded DNA, 17 or p-phenylenediamine.…”