Structural, surface morphology and novel gas sensing properties of chemically deposited CdS-PVA nanocomposites; Impact of thiourea content

II–VI Semiconductor-Based Conductometric Gas Sensors: Is There a Future for These Sensors?

“…For example, based on this approach, a liquefied petroleum gas (LPG) sensor based on an n-CdSe/p-polyaniline (PANI) heterojunction [ 105 ], a gas sensor based on a CdSe/ZnS-polystyrene (PS) nanocomposite sensitive to chloroform, dimethylformamide (DMF), and tetrahydrofuran (THF) [ 106 ], and a sensor with excellent sensitivity to chloroform vapor at room temperature based on a CdSe/P3HT composite [ 107 ] were fabricated. It was also found that PEDOT:PSS/CdS nanocomposites exhibited enhanced sensitivity to LPG [ 108 ], the CdS-polypyrrole (PPY) nanocomposite demonstrated enhanced sensitivity to ammonia gas [ 109 ], CdS-polyvinyl alcohol (PVA) nanocomposites showed high sensitivity for NO 2 gas at an operating temperature of 200 °C [ 110 ], and a nanocomposite-based resistive sensor PS/PMMA-CdSe/ZnS was characterized by an improved response to VOCs [ 111 ]. However, it should be noted that in these sensors, as a rule, II–VI semiconductors play only the role of a conductive additive that improves the electrical conductivity of nanocomposites and the porosity of the polymer matrix.…”