Light-Activated Hybrid Nanocomposite Film for Water and Oxygen Sensing.

Autor:	Muckley ES; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States., Collins L; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States., Ievlev AV; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States., Ye X; Center for Functional Nanomaterials , Brookhaven National Laboratory , Upton , New York 11973 , United States., Kisslinger K; Center for Functional Nanomaterials , Brookhaven National Laboratory , Upton , New York 11973 , United States., Sumpter BG; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States., Lavrik NV; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States., Nam CY; Center for Functional Nanomaterials , Brookhaven National Laboratory , Upton , New York 11973 , United States., Ivanov IN; Center for Nanophase Materials Sciences , Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge , Tennessee 37831-6496 , United States.
Jazyk:	angličtina
Zdroj:	ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2018 Sep 19; Vol. 10 (37), pp. 31745-31754. Date of Electronic Publication: 2018 Sep 05.
DOI:	10.1021/acsami.8b08072
Abstrakt:	Oxygen and water vapor sensing properties are investigated in metal-oxide-hybrid polymer nanocomposite thin films generated by infiltration synthesis, which incorporates molecular ZnO into the matrix of SU-8 polymer, a common negative-tone photoresist. The hybrid thin films display 20-fold higher gravimetric responses to oxygen and water vapor than those of control ZnO thin films in the dark. An additional 50-500% enhanced responses are detected under UV irradiation. The overall enhanced gravimetric response in the hybrid film is attributed to the ZnO molecules distributed in the polymer matrix, whereas the UV enhancement is explained by the light-induced, reversible generation of hydrophilic fluoroantimonic acid from triarylsulfonium hexafluoroantimonate photoacids, which leads to the increased surface potential and adsorption energies for oxygen and water. A gravimetric sensor based on a series of ZnO-infiltrated SU-8 films under UV excitation enables 96% accurate classification of water and oxygen environment with sub 10 mTorr detection limits. The results demonstrate UV-induced fully reversible surface hydrophilicity of ZnO/SU-8 hybrid nanocomposites.
Databáze:	MEDLINE
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