02340nas a2200193   4500008004100000022001400041245010800055210006900163260000800232300001200240490000600252520166800258100001601926700001901942700001801961700002001979700002501999856012202024       2014                        eng d  a2040-336400aZnO(N)-Spiro-MeOTAD hybrid photodiode: an efficient self-powered fast-response UV (visible) photosensor0 aZnONSpiroMeOTAD hybrid photodiode an efficient selfpowered fastr  cFEB  a503-5130 v63 a<p>Organic-inorganic hybrid photo-detectors with a self-sufficient mode of operation represent a research area of great current interest. In most efficient photodetectors and optoelectronic devices compound semiconductors containing toxic elements such as Cd, As, Te, S, Se etc. are used and these are also expensive. Hence there is also a rapidly growing interest in replacing these with environmentally friendly and earth-abundant materials. Herein, we report a facile solution-processed fabrication of a self-powered organic-inorganic hybrid photodetector using n-type oriented ZnO nanorods and p-type Spiro-MeOTAD semiconductor. ZnO is eco-friendly and earth-abundant, and Spiro-MeOTAD is nonhazardous. We show that the latter has far less toxicity than the toxic elements stated above. This visible blind UV photodetector shows high sensitivity (10(2)) and a UV/visible rejection ratio of 300. It also exhibits fast response times of tau(rise) similar to 200 mu s and tau(fall) similar to 950 mu s. Importantly, with a small modification of nitrogen incorporation in ZnO one can also realize a highly-sensitive self-powered visible light photodetector with at least 1000% (or higher) improvements in quality factors (photocurrent/sensitivity/response time) as compared to previously reported organic-inorganic hybrid photo-detectors based on metal-chalcogenides (CdS-PANI or CuInSe2-P3HT). Interestingly, the broadband sensitivity of such N:ZnO-Spiro-MeOTAD photodiode enables sensing of low intensity (similar to 28 mu W cm(-2)) ambient white light with a high photocurrent density of 120 nA cm(-2) making it an efficient ambient white light detector.</p>
1 aGame, Onkar1 aSingh, Upendra1 aKumari, Tanya1 aBanpurkar, Arun1 aOgale, Satishchandra  uhttp://library.ncl.res.in/content/znon-spiro-meotad-hybrid-photodiode-efficient-self-powered-fast-response-uv-visible02434nas a2200193   4500008004100000022001400041245009300055210006900148260000900217300001200226490000700238520175300245100001701998700002702015700002702042700002002069700002702089856012402116       2018                        eng d  a1744-683X00aAqueous dispersions of lipid nanoparticles wet hydrophobic and superhydrophobic surfaces0 aAqueous dispersions of lipid nanoparticles wet hydrophobic and s  cJAN   a205-2150 v143 a<p>Efficient delivery of aqueous sprays to hydrophobic surfaces is the key technological challenge in a wide variety of applications, including pesticide delivery to plants. To account for losses due to bouncing of pesticide sprays off hydrophobic leaf surfaces, a large excess of pesticide is typically employed, resulting in environmentally hazardous run-offs that contaminate soil and ground water. We demonstrate that aqueous dispersions of glycerol monooleate nanoparticles, called cubosomes, wet hydrophobic and superhydrophobic surfaces and adhere to them. Cubosomes comprise glycerol monooleate lipid molecules self-assembled into a double diamond cubic phase, that form stable aqueous dispersions that are sterically stabilized using amphiphilic block copolymers. We use high speed imaging to monitor the spreading and retraction of aqueous drops impinged on model hydrophobic substrates and on superhydrophobic lotus leaves. We show that cubosomes diffuse to hydrophobic substrates and reorganize to form a thin, approximate to 2 nm adsorbed lipid layer during the millisecond time scales that characterize drop impact. This adsorbed film drastically reduces the water contact angle, transforming the hydrophobic surface to hydrophilic, thus facilitating retention of the aqueous drop on the surface. Aqueous drops of cubosomes impinged at low velocities on inclined natural superhydrophobic lotus leaf surfaces do not roll off, unlike drops of water or surfactant solutions. When sprayed on inclined lotus leaves, corresponding to the case of high velocity drop impingement, cubosome dispersions form a continuous wetting film. Our results have important implications for efficient, environment-friendly delivery of pesticide sprays.</p>1 aKumar, Manoj1 aKulkarni, Mayuresh, A.1 aChembu, Narendiran, G.1 aBanpurkar, Arun1 aKumaraswamy, Guruswamy  uhttp://library.ncl.res.in/content/aqueous-dispersions-lipid-nanoparticles-wet-hydrophobic-and-superhydrophobic-surfaces