A nanoporous optically transparent CdS-pHEMA hybrid with high optical sensing capability to dielectric liquids.
A hydrogel-based functional hybrid with highly uniformly dispersed nanoparticulate CdS semiconductors is proposed. The hybrid is synthesized using an in situ polymerization following an in situ chemical reduction, where the resulting particle size and the distribution of CdS nanocrystals (NCs) can be narrowly manipulated. The hybrids, containing a relatively small amount of the CdS NCs, exhibit a pronounced photoluminescence spectrum shift when in contact with a number of dielectric liquids and such a pronounced dielectric-confinement effect has been experimentally verified and modeled in this study. The sensing capability of the hybrids with respect to dielectric liquids or molecules can be optically characterized and varied depending upon the intensity of the dielectric environment surrounding the hybrids. This work suggests that the transparent, nanoporous CdS-pHEMA hybrids can be used as highly efficient optical sensing materials.
Liao
Hung-Chou
HC
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan, ROC.
Liu
Yen-Yu
YY
Chen
San-Yuan
SY
Liu
Dean-Mo
DM
D019187:Cadmium Compounds / Q000737:chemistry*; D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D017097:Electric Impedance; D008163:Luminescent Measurements / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D011102:Polyhydroxyethyl Methacrylate / Q000737:chemistry*; D016062:Porosity; D012031:Refractometry; D018036:Selenium Compounds / Q000737:chemistry*; D012996:Solutions / Q000032:analysis / Q000737:chemistry*; D013499:Surface Properties
D019187:Cadmium Compounds; D046911:Macromolecular Substances; D018036:Selenium Compounds; D012996:Solutions; D011102:Polyhydroxyethyl Methacrylate; C058667:cadmium selenide