Hydrogen Optical Metamaterial Sensor Based on Pd Dendritic Nanostructures

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Rocha Rodrigues, P (Author) Other; Hierro Rodriguez, A (Author) Other; Guerreiro, A (Author) FCUP; Jorge, PAS (Author) FCUP; Santos, JL (Author) Other; araujo, j. p. (Author) FCUP; Miguel Teixeira, JM (Author) Other

Journal

Title: ChemistrySelect

Vol. 1

Pages: 3854-3860

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-00M-EH2

DOI: 10.1002/slct.201600833

Abstract (EN): In this manuscript we present a new type of hydrogen optical metamaterial sensor based on the fabrication of Pd dendritic nanostructures. The fabrication of the sensor relies on a cheap self-assembly process based on the pulsed electrodeposition method in nanoporous alumina templates. By performing optical transmission measurements, we demonstrate how this sensor can monitor hydrogen gas concentrations at room temperature either by evaluating the rate of signal decay during the Pd hydrogen absorption (transient regime) or by measuring the total variation in signal once the system achieves the equilibrium state (stationary regime). We take into account the effects of the Pd-hydrogen phase transition and its size dependency to explain the kinetics of the hydrogen absorption and desorption in the studied samples. By using the transient detection method, the sensor is able to detect in approximately 50 s the explosive H-2(g) concentration threshold of 4% v/v at atmospheric pressure and room temperature.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7