Highly Sensitive Gas Sensor by the LaAlO₃/SrTiO₃ Heterostructure with Pd Nanoparticle Surface Modulation

Abstract

The palladium nanoparticle (Pd NP)-decorated LaAlO3 /SrTiO3 (LAO/STO) heterostructure is for the first time used as a hydrogen-gas sensor with very high sensitivity and workability at room temperature. The outstanding gas-sensing properties are due to the Pd NPs' catalytic effect to different gases, resulting in charge coupling between the gas molecules and the two-dimensional electron gas (2DEG) through the Pd NPs by either a direct charge exchange or a change of the electron affinity. These results provide insight into the emerging properties at LAO/STO interfaces.

WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

“…[14][15][16] Catalytic functionalization of the SMO surfaces turns out to be indispensable for the further enhancement of gas sensitivity and selectivity. Catalysts such as Pt, [ 17 ] Pd, [ 18 ] Si, [ 19 ] and graphene [ 20 ] have been synthesized and functionalized on SMO nanostructures with the objective of improving biomarker detection performances. Thus far, diverse SMO-catalyst composite sensing layers have been proposed that use electrospun SMO nanofi brous structures functionalized with different catalytic nanoparticles (NPs) such as Pt-WO 3 hemitubes, [ 21 ] Pt-SnO 2 nanofi bers (NFs), [ 22 ] Pd-SnO 2 NFs, [ 23 ] and catalytic graphene functionalized with WO 3 nanotubes [ 24 ] for the detection of H 2 S and acetone in exhaled breath.…”

Band gap modulation of SrTiO3 upon CO2 adsorption

“…Recently, Dai et al took one step forward to utilize a two-dimensional electron gas at LaAlO 3 /SrTiO 3 interface for fast and selective detection of various oxidizing and reducing gases at room temperature. 43 However, despite presence of previous experimental reports on both CO 2 uptake [19][20][21] and band gap reduction 33,44 on bare SrTiO 3 (001) surfaces, a corresponding CO 2 sensing mechanism is still to be developed. Motivated by this, in this work, we perform a detailed ab initio study of CO 2 adsorption on the most stable SrTiO 3 surfaces.…”

Solution‐Processed p‐SnSe/n‐SnSe2 Hetero‐Structure Layers for Ultrasensitive NO2 Detection

“…The formation of heterostructures based on 2D materials, especially the p-n heterojunctions, has been proven effective to enhance the sensor performance due to the ability to tune the chargec oncentrationa nd modulate the charge transport at the hetero-interfaces. [9] Normally,t he preparation of p-n heterostructures requires at least two steps,s uch as stepwise growth of one type of materialo na nother, layer by layer stacking,a nd post-growth selectivechemical conversion. [10] Yet, the one-step facile preparation of p-n heterostructures based on 2D materials remains achallenge.…”