SnO₂quantum dots decorated on RGO: a superior sensitive, selective and reproducible performance for a H₂and LPG sensor

Abstract

We report the H2 and LPG gas sensing behavior of RGO/SnO2 QDs synthesized by a surfactant assisted hydrothermal method. The RGO/SnO2 QD based sensor shows a high response of ∼89.3% to H2 and ∼92.4% to LPG for 500 ppm test gas concentration at operating temperatures of 200 °C and 250 °C, respectively. Further, the RGO/SnO2 QD based sensor shows good selectivity for H2 and LPG in the presence of other interfering gases such as ammonia, chloroform, toluene, benzene, acetone, n-butylacetate, acetic acid and formic acid. We observed that the gas response to H2 is 29.8 times higher than that to acetic acid whereas the gas response to LPG is 17.8 times higher than that to formic acid. Long-term analyses have also been performed to demonstrate the reproducible nature of the RGO/SnO2 QD based sensor over passing time which shows excellent reproducibility.

Construction of SnS2–SnO2 heterojunctions decorated on graphene nanosheets with enhanced visible-light photocatalytic performance

“…5b). It is demonstrated that the SnS 2 -SnO 2 -6/RGO sample has a large mesopore centred mainly at 3.98 nm, suggesting that some parts of the small holes have collapsed (Mishra et al, 2015). The smaller poresize mesoporous structure in SnS 2 -SnO 2 -6/graphene facilitate photon diffusion to active sites with less resistance, leading to efficient separation of photo-generated holes and electrons, which is conducive to the improvement of photocatalytic performance (Liu et al, 2014).…”

A Review on Metal Oxide-Graphene Derivative Nano-Composite Thin Film Gas Sensors

“…Hydrothermal is one of the commonly reported techniques for preparing metal oxide nanoparticles-rGO composites. Among different metal oxides, SnO 2 nanoparticles were reported extensively to prepare nano-hybrid with rGO for efficient gas sensing application [33][34][35][36][37][38][39][40][41][42]. SnO 2 /rGO [33][34][35] nano-hybrid was prepared by facile hydrothermal treatment where precursor was prepared with mixture of SnCl 4 , HCl, H 2 O, and GO (or rGO).…”

“…Different weight% (0.5-5 wt.%) of Au was added in the SnO 2 /rGO nanocomposite by using HAuCl 4 salt to study the effect of Au concentration on the sensitivity of SnO 2 /rGO gas sensors [34]. Scanning electron micrograph (SEM) of SnO 2 /rGO films which was used for promising gas sensing application are represented in Figure 1 [36]. Ghosh et al [37] reported SnO 2 nanoparticle synthesis by hydrothermal method and SnO 2 /rGO film synthesis by mixing of SnO 2 nanoparticles with GO.…”

“…Hydrazine hydrate was then added to the mixer to reduce GO Figure 2. TEM images of hydrothermally grown SnO 2 nanoparticles and rGO composites (a) SnO 2 quantum dot on rGO film surface [36], (b) high resolution (HR) TEM image of SnO 2 NPs on rGO [40], and (c) dense SnO 2 NPs on rGO [42]. at 110°C for 8 h [44].…”

Highly sensitive H2S sensors based on Cu2O/Co3O4 nano/microstructure heteroarrays at and below room temperature

“…There have been considerable efforts to improve sensors’ performance under extreme conditions, such as using nanostructured materials with ultra-high surface-to-volume ratios, appropriate element doping, surface decoration with noble metals and construction of heterostructure6789. Among them, heterostructure materials have been confirmed to be ideal materials for low temperature gas detection.…”