Tungsten oxide ion-gated phototransistors using ionic liquid and aqueous gating media
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Universidade Federal de Minas Gerais
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Resumo
Ion-gated transistors employ ionic gating media (e.g. ionic liquids, polymer electrolytes,
aqueous saline solutions) to modulate the density of the charge carriers in the transistor
channel. Not only they operate at low voltages (ca 0.5–1 V) but they can also feature
printability, flexibility and easy integration with chemo- and bio-sensing platforms. Metal
oxides are transistor channel materials interesting for their processability in air, at low
temperature. Among metal oxides, tungsten oxide (band gap ca 2.5–2.7 eV) stands out for its
electrochromic, gas sensing and photocatalytic properties. Here we demonstrate ion-gated
tungsten oxide transistors and phototransistors working in different ion gating media, such as
one hydrophobic ionic liquid and an aqueous electrolyte, fabricated both on rigid and flexible
substrates. Ion-gated tungsten oxide phototransistors operating in aqueous media could be
used as photocatalytic sensors in portable applications.
Abstract
Assunto
Óxidos, Tungstênio, Polímeros
Palavras-chave
Ionic liquids, Tungsten oxide, Ion-gated transistors, Phototransistors, Polyimide
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https://iopscience.iop.org/article/10.1088/1361-6463/ab1dbb