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Pang Z.,Jiangnan University | Yang Z.,Nantong Cellulose Fiber Company Technical Center | Chen Y.,Nantong Cellulose Fiber Company Technical Center | Zhang J.,Jiangnan University | And 3 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2016

We report a facile approach to prepare cellulose/titanium dioxide/polyaniline (cellulose/TiO2/PANI) composite nanofibers that involves P-N heterojunctions at the interface of p-type PANI and n-type TiO2. This work found that the P-N heterojunctions could improve ammonia sensing properties of the prepared nanofibers. Electrospun cellulose acetate nanofibers were deacetylated to prepare regenerated cellulose nanofibers, and then the obtained cellulose nanofibers were immersed into TiO2 sol to adsorb TiO2 nanoparticles onto the surface of them to fabricate cellulose/TiO2 composite nanofibers. In-situ polymerization of aniline was utilized to deposit PANI on the surface of cellulose/TiO2 composite nanofibers. The gas sensing properties of the prepared nanofibers were evaluated by a home-made test system. The cellulose/TiO2/PANI and cellulose/PANI composite nanofibers were exposed to 10, 30, 50, 100, 150, 200 and 250 ppm ammonia vapor at room temperature, respectively. It was found that the response values and sensitivity of cellulose/TiO2/PANI were much higher than those of cellulose/PANI composite nanofibers. Enhanced sensing was obtained by cellulose/TiO2/PANI due to the P-N heterojunctions whose depletion layer would be widened when the composite nanofibers were exposed to ammonia, resulting in their resistance increased dramatically. © 2016 Elsevier B.V.

Fu J.,Jiangnan University | Pang Z.,Jiangnan University | Yang J.,Jiangnan University | Yang Z.,Nantong Cellulose Fiber Company Technical Center | And 4 more authors.
Electroanalysis | Year: 2015

We fabricated a novel hierarchical composite mat composed of electrospun cellulose nanofibers decorated with Ag-doped ZnO (Ag-ZnO) nanoparticles and further demonstrated its potential application as the efficient laccase (Lac) biosensor substrate material. The cyclic voltammograms revealed that the Ag-ZnO/cellulose nanofibrous mat provided an excellent microenvironment for Lac immobilization and benefited direct electron transfer of Lac. The fabricated Lac/Ag-ZnO/cellulose/GCE exhibited a highly sensitive detection of catechol with a wide linear range from 0.995 to 811μM and a low detection limit of 0.205μM. The results indicated that Ag-ZnO/cellulose nanofibers were the promising nanostructured materials for the construction of different biosensors. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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