Enhanced room-temperature NH3 gas sensing by 2D SnS2 with sulfur vacancies synthesized by chemical exfoliation

State of the Art in Alcohol Sensing with 2D Materials

“…The ability to prepare these groups of nanosheets in high yield and large scale via various methods, such as mechanical exfoliation [114], electrochemical lithiation [115], liquid exfoliation with sonication [116], and chemical vapour deposition (CVD) growth [117], has led to increasing studies on their hybridisation with other materials to create novel functional composites, aiming to engineer their chemical, physical, and electronic properties and thus achieve good performance for some specific applications. One of the most popular applications of TMDs is using them as photodetectors, gas sensors, moisture sensors, and biosensors [118][119][120][121][122][123][124]. Among members of this family, sulphides and selenides of Mo and W are the most studied with several investigations on tuning their properties through chemical functionalisation or pairing them with other 2D materials, such as graphene, through van der Waal forces to form what is known as 2D heterostructures [124].…”

In Situ Formation of Multiple Schottky Barriers in a Ti3C2 MXene Film and its Application in Highly Sensitive Gas Sensors

“…[1][2][3][4][5][6][7][8][9] In addition, they have special active sites, such as vacancy, defect, and edge structures, and their functional groups can be modified to achieve different sensing behaviors. [10][11][12][13][14][15] The main gas-sensing mechanisms of 2D materials are surface charge transfer and Schottky barrier (SB) modulation, which induces a shift in the electrical resistance of the material when gas molecules are adsorbed on the surface of the material. [16][17][18][19] During surface charge transfer, interactions between the gas molecules and 2D materials lead to a variety of increasing or decreasing resistance behaviors depending on the main carrier of the semiconductor and the electron donating/ withdrawing properties of the gas molecules.…”

Photo-enhanced gas sensing of SnS2 with nanoscale defects

“…16,20,23,25,26 As a member of the wide class 2D materials, tin disulde (SnS 2 ) displays many intriguing properties in electronics, 27 photonics and optoelectronics, [27][28][29][30] as well as gas monitoring. 24,[31][32][33][34][35][36][37][38][39][40][41][42] It was reported recently by Kalantar-zadeh et al that a SnS 2 -based NO 2 gas sensor with a sensitivity of 0.5 ppm could be improved to 30 ppb when heated to 120 C. 24 However, an elevated operating temperature typically increases power consumption and thus a more intricate setup is required. 3,10,16,20,24,25,43 Furthermore, the high operating temperature might pose the risk of ignition when detecting in ammable or explosive atmospheres which would limit sensor's application.…”