Considerable humidity response of a well-aligned SOMS micro-wire flexible sensor by moisture-induced releasing of trapped electrons
| Autor: | Hsin-Tien Chiu, Kuei Lin Chan, Min Han Yang, Chi-Young Lee |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Response time Humidity Nanotechnology 02 engineering and technology Substrate (electronics) Orders of magnitude (numbers) 010402 general chemistry 021001 nanoscience & nanotechnology Molecular sieve 01 natural sciences 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Electric field Optoelectronics Grotthuss mechanism Niobium pentoxide 0210 nano-technology business |
| Zdroj: | Dalton Transactions. 46:10859-10866 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/c7dt02366a |
| Popis: | Sandia Octahedral Molecular Sieves micro-wires (SOMS MWs) that exhibit ultra-high response to moisture and a short response time can be produced easily in an environmentally friendly mass production process. They are excellent candidate materials for use in humidity sensors. SOMS MWs were synthesized using niobium pentoxide as a precursor in concentrated sodium hydroxide solution. To fabricate humidity-sensing devices, electrophoresis was utilized to align the SOMS MWs on a polyethylene terephthalate (PET) substrate. The degree of alignment of SOMS MWs can be tuned by controlling the electric field during electrophoresis. Both well-aligned SOMS MWs (S-1.00) and randomly distributed SOMS MWs (S-0.00) exhibit maximum sensitivities to humidity (RRH/RDRY) of almost 104 and 107 respectively, and both exhibit short response times (34 and 38 s) and recovery times (7 and 10 s); these MWs outperform metal oxide ceramic-based materials in sensing humidity. Furthermore, the humidity response of S-1.00 exceeds that of S-0.00 by three orders of magnitude, and this result cannot be explained with reference to the Grotthuss mechanism. Therefore, the moisture-induced carriers from trapped electrons contribute significantly to the humidity response of SOMS MWs. In addition, with outstanding humidity sensing-performance under extreme bending conditions and superior durability after being bent hundreds of times, the well-aligned SOMS MW sensor is a favorable candidate for emerging multifunctional electronic-skin. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|