02341nas a2200193 4500008004100000022001400041245010800055210006900163260000800232300001200240490000600252520166800258100001601926700001901942700001801961700002001979700002501999856012302024 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

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.

1 aGame, Onkar1 aSingh, Upendra1 aKumari, Tanya1 aBanpurkar, Arun1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/znon-spiro-meotad-hybrid-photodiode-efficient-self-powered-fast-response-uv-visible02435nas a2200193 4500008004100000022001400041245009300055210006900148260000900217300001200226490000700238520175300245100001701998700002702015700002702042700002002069700002702089856012502116 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

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.

1 aKumar, Manoj1 aKulkarni, Mayuresh, A.1 aChembu, Narendiran, G.1 aBanpurkar, Arun1 aKumaraswamy, Guruswamy uhttps://library.ncl.res.in/content/aqueous-dispersions-lipid-nanoparticles-wet-hydrophobic-and-superhydrophobic-surfaces02014nas a2200253 4500008004100000022001400041245010800055210006900163260000900232490000800241520117300249653002001422653001501442653001601457653002801473100001901501700001701520700002501537700001801562700002001580700002101600700001601621856012301637 2024 eng d a0169-433200aEffects of gamma irradiation on non-polar GaN films deposited on sapphire using pulsed laser deposition0 aEffects of gamma irradiation on nonpolar GaN films deposited on  cMAY 0 v6543 a

The GaN films/layers exposed to gamma-radiations is known to harvest defects and vacancies in the crystals producing donor, acceptor and recombination centers within the bandgap. Therefore it is important to investigate and study the gamma- ray irradiation effects on various physical and chemical properties of a material before any optoelectronic and/or electronic devices are being fabricated. To avoid Stark effect which is observed in most of the optoelectronic devices fabricated using GaN films grew along polar face, use of non-polar GaN films is suggested by researchers. To address such issues the article reports the investigations of physical and chemical properties of non-polar GaN films grown on polar substrate using pulsed laser deposition, which were exposed to the 60Co gamma rays varying dose values. Resistive nature against the impairment of the films caused by gamma-rays observed herewith is highly encouraging, suggesting the use of non-polar GaN films as radiations harden material suitable for fabricating new generation gamma-ray detectors. To our knowledge very limited information is available that report such investigations.

10aGallium nitride10aGamma rays10aPL emission10apulsed laser deposition1 aRajgoli, Tahir1 aSant, Tushar1 aJejurikar, Suhas, M.1 aHinge, Sandip1 aBanpurkar, Arun1 aDahiwale, S., S.1 aLate, Datta uhttps://library.ncl.res.in/content/effects-gamma-irradiation-non-polar-gan-films-deposited-sapphire-using-pulsed-laser02390nas a2200325 4500008004100000022001400041245009900055210006900154260000800223300001100231490000700242520135600249653001901605653002101624653002401645653002401669653003101693100001801724700002301742700001901765700001901784700002001803700001701823700001601840700001901856700002001875700002101895700001801916856013001934 2026 eng d a1861-472800aPolysulfone-based polymer carbon dot membrane for optical dissolved oxygen sensing application0 aPolysulfonebased polymer carbon dot membrane for optical dissolv cMAR ae706850 v213 a

The precise monitoring of dissolved oxygen (DO) is essential across industrial, environmental, and biomedical applications. However, the state-of-the-art DO sensing methods often suffer from inherent limitations, which hinder their effectiveness for real-time and long-term DO monitoring. Optical DO sensing, despite its advantages, utilizes expensive metal complexes and is prone to photobleaching and slow response time. Here, we introduce a novel polymer carbon dot (PCD) as a promising candidate for lifetime-based optical DO sensing. The PCD is a metal-free, nontoxic, fluorescent, long decay-lifetime material that is synthesized through hydrothermal method. Our fluorescent PCD exhibits high emission quantum yield (24.32%), long decay-lifetime (10.43 & micro;s), and a linear response to DO concentrations ranging from 0.7 to 12.7 mg/L, with a Stern-Volmer constant of 0.1115. Further, to obtain better oxygen diffusion, high porosity, optical transparency, and high flexibility, PCD was embedded into a polysulfone matrix (PSF_PCD). The PSF_PCD membrane shows better results for the decay lifetime (9.4 & micro;s), surface energy (40.26 mN/m), and average pore diameter of 5 nm. Hence, the obtained results demonstrate the applicability of the PCD in optical DO sensors for real-time and long-term monitoring of DO levels.

10adecay lifetime10adissolved oxygen10aHydrothermal method10apolymer carbon dots10apolysulfone-based membrane1 aKadam, Rutuja1 aHattale, Gangadhar1 aVirole, Vishal1 aPal, Sanjivani1 aAbraham, Athira1 aPaul, Aditya1 aKumar, Ajay1 aShevate, Rahul1 aBanpurkar, Arun1 aKanawade, Rajesh1 aSaha, Avishek uhttps://library.ncl.res.in/content/polysulfone-based-polymer-carbon-dot-membrane-optical-dissolved-oxygen-sensing-application