Finite size effect on hydrogen gas sensing performance in single Pd nanowires

Abstract

We present the hydrogen sensing performance of individual Pd nanowires grown by electrodeposition into nanochannels of anodized aluminum oxide (AAO) templates investigated as a function of the nanowire diameter. Four-terminal devices based on individual Pd nanowires were found to successfully detect hydrogen gas (H(2)). Our experimental results show that the H(2) sensing sensitivity increases and the response time decreases with decreasing diameter of Pd nanowires with d = 400, 200, 80 and 20 nm, due to the high surface-to-volume ratio and short diffusion paths, respectively. This is in qualitatively good agreement with simulated results obtained from a theoretical model based on a combination of the rate equation and diffusion equation.

Effect of Molecular Adsorption on the Electrical Conductance of Single Au Nanowires Fabricated by Electron‐Beam Lithography and Focused Ion Beam Etching

“…Despite the possibilities presented by metal nanowires for chemical sensing, relatively little attention has been given to the application of metal nanowires as resistive sensors 4–6, 9–25. In addition, the studies that have appeared present different saturation values of normalized resistance change (Δ R max / R 0 ).…”

Nanoporous Templates and Membranes Formed by Nanosphere Lithography and Aluminum Anodization

“…For instance, metallic films with holes templated by nanoporous AAO possess plasmonic properties that are related to the AAO pore spacing 6, 7. Similarly, the diameter of palladium nanowires fabricated in AAO templates controls their sensitivity to hydrogen gas,8 and the sensor response time for palladium nanoparticles deposited into AAO is highly dependent on the pore depth 9. Pore diameter, length, and spacing are also expected to influence the performance of nanoporous membranes in applications such as biosensors, nanoscale filters, photovoltaics, and catalytic supports.…”

Nanostructures of Pd–Ni alloy deposited on carbon fibers for sensing hydrogen

“…For example, Pd nanofilms, nanowires and nanoparticles [1][2][3] have been widely applied in hydrogen sensors. Many methods have been applied to prepare of different nanostructures, including thermal evaporation [4], electroless technique [5], electrochemical step-edge decoration [6,7], self-assembly [8], sputter deposition [9], and so on.…”