Modified SnO2-APTES gas sensor for selective ammonia detection at room temperature

Abstract

The feasibility of room temperature ammonia gas sensors based on tin dioxide (SnO 2 ) functionalization has been demonstrated. 3-aminopropyltriethoxysilane (APTES) was used as an intermediate step, followed by functionalization with molecules having acyl chloride with different end functional groups molecules such as alkyl, acid and ester groups. Modified films were characterized by attenuated total reflectance infra-red spectroscopy (ATR-FTIR). Upon exposure to ammonia gas, the electrical conductance of alkyl, acid and ester modified SnO 2 -APTES increases, whereas other reducing gases such as ethanol, carbon monoxide and acetone show no change in conductance. Furthermore, ester modified SnO 2 is more selective than acid modified sensor regarding ethanol and carbon monoxide gases.

Exploring the Contribution of Intelligent Nanomaterials in Gas Sensing

“…They serve as the foundational elements of nanotechnology, allowing for the study, characterization, construction, and analysis of materials with diverse shapes that can be manipulated chemically or physically for a multitude of applications [60] . Nanomaterials find utility either in isolation [63] or as composites for sensing purposes [64] . Their intrinsic analytical properties, which are closely related to their nanoscale dimensions, encompass attributes like biocompatibility, quantum effects, and a high surface area‐to‐volume ratio.…”

Effect of synthesis variables on the characteristics of magnesium hydroxide nanoparticles and evaluation of the fluorescence of functionalised Mg(OH)2 nanoparticles

“…As expected, the Mg(OH) 2 NPs spectrum was nearly featureless, just showing the OH − (3698 cm −1 ) and O-Mg-O and Mg-OH (450-571 cm −1 ) bands [17,37]. However, the spectrum for the NPs after treatment with APTES showed several of the APTES bands, -NH 2 (3360 and 3240 cm −1 ), -CH 2 (2930 and 2890 cm −1 ), -NH (1630 cm −1 ) and Si-O-Si (1050 cm −1 ) [38][39][40][41]. The intensity of the peaks in all cases decreased, and the Si-O-Si peak appeared to be slightly displaced to higher frequencies.…”

State-of-the-Art on Functional Titanium Dioxide-Integrated Nano-Hybrids in Electrical Biosensors

“…Conductive polymers and metal oxide nanohybrids are of special interest for improving the properties of sensors. [56][57][58] In fact, studies on TiO 2 /polymer nanohybrid for biosensor applications are still lacking. Kim et al [59] reported the hybridization of (3-Aminopropyl)triethoxysilane (APTES) with titanate for nucleic acid recovery.…”