Pt Nanoparticle-Decorated ZnO Nanowire Sensors for Detecting Benzene at Room Temperature

Abstract

Room temperature gas sensing ability for low concentrations of benzene was successfully realized with Pt nanoparticle-decorated networked ZnO nanowire sensors. For decoration of Pt nanoparticles, gamma-ray radiolysis was used. The Pt decoration greatly enhanced benzene sensing performances. Importantly, even at room temperature, ppm level benzene was clearly detected, which is likely to be due to the combined effect of electronic and chemical sensitizations by Pt nanoparticles.

Highly Selective Sensing of CO, C6H6, and C7H8 Gases by Catalytic Functionalization with Metal Nanoparticles

“…Attachment or functionalization of noble metal nanoparticles (NPs) has often been used to improve the sensing abilities of oxide NWs. − The improvement is attributed to electronic and/or chemical sensitizations by the metal NPs. , For that purpose, noble metals are usually attached in the form of NPs to the NW surfaces using a variety of methods, such as photochemistry, aerosol-assisted chemical vapor deposition, silanization processes, wet-chemical reduction, γ-ray radiolysis, , and chemically driven self-assembly methods . One of the important advantages brought by the metal NP functionalization is the enhancement of the selective detectability for specific gases due to the special catalytic sensitization with regards to the type of noble metals used.…”

Optimum shell thickness and underlying sensing mechanism in p–n CuO–ZnO core–shell nanowires

“…One widely accepted approach is the use of nanowires (NWs) instead of their film or bulk counterparts, due to their unique physical and chemical properties including a high surface-tovolume ratio, single crystalline nature, self-heating, quantum confinement, and small diameter approaching the Debye length [1][2][3][6][7][8]. These properties are all promising for the realization of improved sensing properties.…”

Effect of the Functionalization of Porous Silicon/WO3 Nanorods with Pd Nanoparticles and Their Enhanced NO2-Sensing Performance at Room Temperature

“…However, resistive-type MOS gas sensors are generally poor selectively to many gases because many gas species may cause simultaneous resistance changes, making it impossible to properly identify the gas with a single sensor [ 12 ]. Several approaches, such as structure manipulation, decoration of noble metals (including Au, Pt, and Pd [ 13 , 14 , 15 ]), and heterostructure formation have been reported by several researchers to improve the selectivity of MOS gas sensors [ 16 , 17 , 18 ]. Among these approaches, noble metal nanoparticle (NP) decoration is promising in gas-sensing enhancement.…”