Title :
UV-Assisted Alcohol Sensing With Zinc Oxide-Functionalized Gallium Nitride Nanowires
Author :
Bajpai, Ritu ; Motayed, Abhishek ; Davydov, Albert V. ; Bertness, Kris A. ; Zaghloul, Mona E.
Author_Institution :
Dept. of Electr. & Comput. Eng., George Washington Univ., Washington, DC, USA
fDate :
7/1/2012 12:00:00 AM
Abstract :
Alcohol sensors using gallium nitride (GaN) nanowires (NWs) functionalized with zinc oxide (ZnO) nanoparticles have been demonstrated. These sensors operate at room temperature, are fully recoverable, and demonstrate a response and recovery time on the order of 100 s. The sensing is assisted by UV light within the 215-400-nm band and with the intensity of 375 nW/cm2 measured at 365 nm. The ability to functionalize an inactive NW surface, with analyte-specific active metal-oxide nanoparticles, makes this sensor technique suitable for fabricating multianalyte sensor arrays.
Keywords :
II-VI semiconductors; III-V semiconductors; chemical sensors; gallium compounds; nanofabrication; nanoparticles; nanosensors; nanowires; organic compounds; sensor arrays; ultraviolet detectors; wide band gap semiconductors; zinc compounds; GaN-ZnO; NW surface; UV-assisted alcohol sensing; analyte-specific active metal-oxide nanoparticle; multianalyte sensor array fabrication; nanowire surface; temperature 293 K to 298 K; time 100 s; wavelength 215 nm to 400 nm; Conductivity; Gallium nitride; Nanoparticles; Sensitivity; Temperature sensors; Zinc oxide; Chemical sensors; nanoparticles; nanoscale devices; photoconductivity; semiconductor nanostructures;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2012.2194129
