TY  - JOUR
AU  - Bahadur, Jitendra
AU  - Das, Avik
AU  - Prakash, Jyoti
AU  - Singh, Pankaj
AU  - Khan, Arshad
AU  - Sen, Debasis
TI  - Role of trapped water on electroresponsive characteristic of silica-graphene oxide composite microspheres
JO  - Journal of applied physics
VL  - 126
IS  - 20
SN  - 1089-7550
CY  - Melville, NY
PB  - American Inst. of Physics
M1  - FZJ-2019-06865
SP  - 204301 -
PY  - 2019
AB  - Electroresponsive microspheres containing nanosilica and graphene oxide (GO) sheets have been achieved by the one-step evaporation induced assembly of mixed colloids using spray drying. The interlocking of the nanostructured constituents by the attractive capillary force during drying of dispersion droplets results in the formation of powder grains with correlated nanoparticles and nanosheets. The presence of GO sheets arrests the buckling of the drying droplets during evaporative assembly and results in well-defined spherical shaped grains. Interestingly, this approach of random jamming in colloidal droplets is capable of preventing the spontaneous stacking of the GO sheets and, therefore, facilitates a way to confine the atomic-thick GO sheet in the solid matrix. A plausible mechanism for the formation of silica-GO binary composite microspheres is elucidated. Microspheres dispersed in insulating oil show interesting electroresponsive characteristics where the microspheres form a chainlike percolation path under the applied electric field. It has been established that the adsorbed water in the microspheres plays a profound role as far its electroresponsive behavior is concerned. GO sheets in the microspheres allow for tuning of electroresponse strength owing to the increased interaction of water molecules to the oxygen-containing functional groups anchored on the GO sheets.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000504006000015
DO  - DOI:10.1063/1.5124910
UR  - https://juser.fz-juelich.de/record/868315
ER  -