Liquid-Phase Co-Exfoliated Graphene/MoS₂ Nanocomposite for Methanol Gas Sensing

Abstract

We developed an efficient method to co-exfoliate graphite and MoS2 to fabricate graphene/MoS2 nanocomposite. The size, morphology, and crystal structure of the graphene/MoS2 nanocomposite were carefully examined. The as-prepared graphene/MoS2 nanocomposite was fabricated into thin film sensor by a facile drop casting method and tested with methanol gas in various concentrations. The sensitivity, response time, and repeatability of the graphene/MoS2 nanocomposite sensor towards methanol gas were systematically investigated. A pure MoS2 based thin film sensor was also prepared and compared with the nanocomposite sensor to better understand the synergetic effect in the sensing performance. Our research demonstrated that compositing MoS2 with graphene could overcome the shortcoming of MoS2 as a sensor material and bring in a promising gas-sensing performance with a quicker response/recovery time and an enhanced sensitivity. Moreover, this composited material with a distinct structure and an excellent electronic property is expected to have potential application in various fields, such as optoelectronic.

Large-Scale Preparation of MoS2/Graphene Composites for Electrochemical Detection of Morin

“…However, it requires multiple complex steps, and thus, the synthesis of the composites is time-consuming. In contrast, the in situ strategy is to form the nanocomposites of MoS 2 and graphene sheets directly through ionic reactions such as chemical vapor deposition (CVD), hydrothermal and solvothermal methods, chemical reduction, and so forth. − As compared with the ex situ approach, the in situ approach has the merit that MoS 2 /graphene composites can be obtained with uniform dispersion and architectures . Although CVD, hydrothermal, solvothermal, and chemical reduction methods are the most popular approaches for composite fabrication, they still possess limitations that need to be addressed.…”

Solid-State Method Synthesis of SnO2-Decorated g-C3N4 Nanocomposites with Enhanced Gas-Sensing Property to Ethanol

“…Graphene, a representative of 2-D material, has been a focus of scientific research because of its unique property and structure with a unilaminar sp 2 -hybridized carbon atom configuration. In recent years, graphene and reduced graphene oxide (r-GO) have been widely used for gas-sensing investigation due to their large specific surface area and excellent conductivity [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ]. Many researchers reported that metal oxide-decorated graphene nanocomposite-based sensors exhibited superior sensibility to different gases [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”

Electrochemical antioxidant screening and evaluation based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE)

“…The MoS 2 nanosheet was prepared by MoS 2 powder according to literature [16] with some modifications. Briefly, 300 mg of MoS 2 powders were dispersed in 100 mL of mixtures consisted of acetone and water (v:v, 89:11) to obtain MoS 2 suspension (3 mg mL -1 ).…”