Near-Infrared Laser-Annealed IZO Flexible Device as a Sensitive H₂S Sensor at Room Temperature

Abstract

A metal-oxide material (indium zinc oxide [IZO]) device with near-infrared (NIR) laser annealing was demonstrated on both glass and bendable plastic substrates (polycarbonate, polyethylene, and polyethylene terephthalate). After only 60 s, the sheet resistance of IZO films annealed with a laser was comparable to that of thermal-annealed devices at temperatures in the range of 200°C-300°C (1 hr). XPS, ATR, and AFM were used to investigate the changes in the sheet resistance and correlate them to the composition and morphology of the thin film. Finally, the NIR laser-annealed IZO films were demonstrated to be capable of detecting changes in humidity and serving as a highly sensitive gas sensor of hydrogen sulfide (in parts-per-billion concentration), with room-temperature operation on a bendable substrate.

Exploiting Thermoplasmonic Effects for Laser‐Assisted Preparation of Au Nanoparticles/InZnO Thin Film with Visible Range Photodetection Properties

“…In Figure 3a, the changes observed under thermal annealing are consistent with those reported previously. [ 21 ] A significant decrease in vacancies was observed with an increase in the M‐O, which corresponds to the condensation reactions induced by thermal treatments. The moderate temperature leads to amorphous materials, which explain the relatively high level of vacancies in the final material.…”

“…Furthermore, we recently showed that the use of NIR dyes can significantly improve the NIR laser curing of sol–gel indium‐zinc‐oxide (IZO) materials and allow their use as gas sensors. [ 21 ]…”

“…Furthermore, we recently showed that the use of NIR dyes can significantly improve the NIR laser curing of sol-gel indium-zinc-oxide (IZO) materials and allow their use as gas sensors. [21] One of the key parameters for the laser curing of MO precursors is to generate high absorption and efficient conversion to thermal energy. Because the sol-gel layers have an intrinsic low absorption in the NIR, it is necessary to add absorbers in the thin film to generate a local temperature increase.…”

Ammonia Gas Sensor Response of a Vertical Zinc Oxide Nanorod-Gold Junction Diode at Room Temperature

“…The overall current increased with increasing humidity. This could be due to the adsorption of water on the ZnO surface and its subsequent dissociation into hydroxide and protons, which could lead to enhanced conductivity due to a proton hopping mechanism . The presence of water would also allow ammonia to adsorb onto the surface as ammonium hydroxide, which could enhance its reactivity and explain the faster response at higher humidity.…”

Ultra‐Robust Flexible Electronics by Laser‐Driven Polymer‐Nanomaterials Integration

“…[ 9,10 ] These laser‐based approaches include the synthesis of conductive silver patterns on polyimide [ 11 ] and polyurethane, [ 12 ] crystallization of BiVO 4 films, [ 13 ] carbonization of organic particle films on PET, [ 14 ] and metallization of a Cu‐containing polymer, [ 15 ] and photothermal annealing of indium zinc oxide on different polymers. [ 16 ] The introduction of different materials in the bulk polymer was exploited to enable laser processing for polymer marking, including additives such as graphene/polystyrene, [ 17 ] antimony trioxide polystyrene, [ 18 ] TiO 2 nanoparticles, [ 19 ] and oxides like Fe 3 O 4 , ZrO 2 , [ 20 ] and SnO 2 . [ 21 ] For this application, the laser‐driven embedding of dyes into the surfaces of polymers is particularly interesting by combining spray coating with laser curing for marking purposes.…”