LPG sensor based on complete inorganic n-Bi₂S₃-p-CuSCN heterojunction synthesized by a simple chemical route

Abstract

An effective and versatile room temperature soft chemical route was employed to deposit n-Bi2S3 films followed by p-CuSCN films onto fluorine doped tin oxide (FTO) coated glass substrates. Well optimized preparative parameters led to the formation of a good heterojunction between the n-Bi2S3 and p-CuSCN films without any post-annealing treatment. An interconnected microflake of CuSCN on to the nanocrystalline Bi2S3 film enables a high porous structure in the top layer. The device was completed by ensuring silver as a front and FTO as a back ohmic contact, and exposed to sense the liquefied petroleum gas (LPG) at room temperature (27 °C). The upper porous structure allowed enough room for the gas species to adsorb and de-adsorb easily at the interface. The device exhibited more than 70% response at 1370 ppm of LPG, and the process suggests the possibility to develop a room temperature LPG sensing device with a low cost chemical method.

SILAR coated Bi2S3 nanoparticles on vertically aligned ZnO nanorods: Synthesis and characterizations

“…The immersion time of the substrate in an anionic and cationic precursor was taken as 60 s each, with 30 s rinsing time in double distilled water. The film waswashed with double distilled water in intermediate steps[19]. Upon completion of each cycle, a thin layer of Bi 2 S 3 nanoparticles was deposited onto the ZnO nanorods surface.…”

Nanomaterials for Sensing Applications

“…Many reports are focused on nanomaterials hetero junctions i.e. two layer type nanomaterials development to sense different gases [85][86][87][88][89]. The amorphous/porous nature of the silicon deposited by the plasma enhanced chemical vapor deposition technique was used under bias condition to enhance the sensitivity towards ethanol and water vapors [85].…”

“…Recently, a few reports have emerged for room temperature LPG sensors based on electrochemically deposited p-poly aniline with n-CdTe deposited by the electrochemical method [88]. Ladhe RD et al [89] was used room temperature soft chemical route for producing n-Bi 2 S 3 films followed by p-CuSCN films onto Fluorine doped Tin Oxide (FTO) coated glass substrates for LPG gas sensor at room temperature. The device exhibited more than 70% response at 1370 ppm of LPG because upper porous structure allowed enough room for the gas species to adsorb and de-adsorb easily at the interface [89].…”

“…Ladhe RD et al [89] was used room temperature soft chemical route for producing n-Bi 2 S 3 films followed by p-CuSCN films onto Fluorine doped Tin Oxide (FTO) coated glass substrates for LPG gas sensor at room temperature. The device exhibited more than 70% response at 1370 ppm of LPG because upper porous structure allowed enough room for the gas species to adsorb and de-adsorb easily at the interface [89]. The nanocomposites of ZnO with CdO synthesized by sol-gel pyrolysis method based on polymeric network of polyvinyl Alcohol (PVA) of nanograin's diameter varying from 70 to 90 nm were used for CO gas detection.…”

p-PEDOT:PSS as a heterojunction partner with n-ZnO for detection of LPG at room temperature

“…The gas sensing properties of n-ZnO/p-PEDOT:PSS (3,4 polyethylenedioxythiophene:poly (styrene sulfonic acid)) heterojunction were studied by using a lab-made gas sensor unit described elsewhere [16]. The forward biased current density-voltage (J-V) characteristics of the junction, before and after exposure to gas environment were measured at room temperature in a voltage range of 0-3 V. The electrical current of n-ZnO/p-PEDOT:PSS heterojunction in air (Ia) and in the presence of gas (Ig) was measured.…”