Flexible Synergistic MoS₂ Quantum Dots/PEDOT: PSS Film Sensor for Acetaldehyde Sensing at Room Temperature

Abstract

Acetaldehyde (CH 3 CHO) is known as a primary carcinogen, and the development of wearable gas sensors for its detection at room temperature has rarely been rarely reported. Herein, MoS 2 quantum dots (MoS 2 QDs) have been employed to dope with poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT: PSS) via a simple in situ polymerization technique, and the CH 3 CHO gas-sensing properties of the resultant flexible and transparent film were investigated. MoS 2 QDs had been evenly dispersed into the polymer, and it was shown that PEDOT: PSS doped with the 20 wt % MoS 2 QDs sensor exhibited the highest response value of 78.8% against 100 ppm CH 3 CHO and its detection limit reached 1 ppm. Moreover, the sensor response remained stable for more than 3 months. In particular, the different bending angles (from 60 to 240°) had little effect on the sensor response to CH 3 CHO. The possible reason for the enhanced sensing properties was attributed to the large number of reaction sites on the MoS 2 QDs and the direct charge transfer between the MoS 2 QDs and PEDOT: PSS. This work suggested a platform to inspire MoS 2 QDs-doping PEDOT: PSS materials as wearable gas sensors for highly sensitive chemoresistive sensors to detect CH 3 CHO at room temperature.

Solution-processing approach of nanomaterials toward an artificial sensory system

“…Jin et al fabricated an E-nose system by drop casting MoS 2 QD on the Au IDEs to sense various volatile organic compounds (VOCs). The E-nose successfully discriminated 100 ppm levels of acetaldehyde [157]. Lorwongtragool et al created a wearable E-nose by inkjet printing of CNTs on polyethylene naphthalate substrate demonstrating its ability to distinguish VOCs from armpit regions in a compact armband format with wireless connectivity [158].…”

Rapidly detecting the carcinogen acetaldehyde: preparation and application of a flower-like MoS2 cataluminescence sensor at low working temperature

“…6 Acetaldehyde is “one of the most common air toxins with a carcinogenic risk of more than one in a million”, 7 and is therefore classified as a class I carcinogen because it destroys deoxyribonucleotides and causes muscle development abnormalities when combined with proteins. 8 Therefore, it is necessary to establish an acetaldehyde sensing method with high sensitivity and selectivity.…”

Handheld Crop Pest Sensor Using Binary Catalyst-Loaded Nano-SnO2 Particles for Oxidative Signal Amplification

“…are expected to change the paradigm of health monitoring. − Similarly, a volatile sensor for plant disease detection using SERS signals has been demonstrated . The chemoresistive technique gains appreciation for its simplicity since it can be handled even by unskilled persons, requires no sample preparation steps, and offers reusability of the sensor platform, tunable selectivity by working temperature, and compatibility to miniaturize. , Chemoresistive volatile sensors use metal oxide-based transducers, which exhibit a change in electrical resistance on exposure to the target gas by accepting or donating the electron from the oxidation or reduction of the analyte, respectively . The ability of the platform to show matching redox activity is the key to improve the sensitivity and selectivity .…”

“…12,13 Chemoresistive volatile sensors use metal oxide-based transducers, which exhibit a change in electrical resistance on exposure to the target gas by accepting or donating the electron from the oxidation or reduction of the analyte, respectively. 14 The ability of the platform to show matching redox activity is the key to improve the sensitivity and selectivity. 15 To achieve this, semiconductors and noble metals having catalytic facets for adsorption/desorption and reactivity 16,17 were engineered together for ppb/μM level of detection.…”