Recent progresses in plasmon-induced hot electrons open up the possibility to achieve photon harvesting effiiencies beyond the fundamental limit imposed by band-to-band transitions in semiconductors. To obtain high efficiency, both the optical absorption and electron emission/collection are crucial factors that need to be addressed in the design of hot electron devices. Here, we demonstrate a photoresponse as high as 3.3mA/W at 1500nm on a silicon platform using a plasmonic absorber (PA) and an omni-Schottky junction integrated photodetector, reverse biased at 5V and illuminated with 10mW. The PA fabricated on silicon consists of a monolayer of random Au nanoparticles (NPs), a wide-band gap semiconductor (TiO2) and an optically thick Au electrode, resulting in broadband near-infrared (NIR) absorption and efficient hot-electron transfer via an all-around Schottky emission path. Time and spectral photoresponse measurements reveal that when the embedded NPs absorb the indicent radiation they act as local heating sources and transfer their energy to electricity via the photothermal mechanism, which until now has not been adequately assessed or rigorously differentiated from the photoelectric process in plasmon-mediated photon harvesting nano-systems

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This study presents a method for incorporating cholecalciferol of a poorly water‐soluble vitamin into poly(vinyl pyrrolidone) fibers by electrospinning. The poorly water‐soluble vitamin was incorporated into water‐soluble polymeric matrix of nanofibers with the rapid evaporation of solvent during the electrospinning process. The scanning electron microscope (SEM) images showed that the diameter of nanofibers is range of 0.2‐2.9 μm. The physicochemical properties of the composite nanofibers were characterized by using Fourier‐transform infrared (FTIR) spectroscopy and Differential scanning calorimetry (DSC). 82.1 % and 51.9 % of cholecalciferol was released in the first 20 s from the composite nanofibers with a drug‐to‐PVP ratio of 1:4 and 1:2, respectively. POLYM. COMPOS., 2013 © 2013 Society of Plastics Engineers