01693nas a2200181 4500008004100000245010200041210006900143260000800212300001400220490000600234520103100240100001901271700002301290700003001313700001901343700001901362856013001381 2017 eng d00aColloidal nanocomposite of TiN and N-doped few-layer graphene for plasmonics and electrocatalysis0 aColloidal nanocomposite of TiN and Ndoped fewlayer graphene for  cOCT a2251-22560 v23 a

A combination of high carrier density, high surface area, solution processability, and low cost is desired in a material for electrocatalytic applications, including H-2 evolution and a counter electrode of a solar cell. Also, plasmonic-based applications in biological systems can be derived from such material. In this regard, a colloidal nanocomposite of TiN and N-doped few-layer graphene (TiN NFG) is synthesized from molecular precursors. TiN nano crystals (NCs) provide free electrons for electrical conductivity and plasmonics, whereas NFG is responsible for charge transport, high surface area, and colloidal stability. Colloidal TiN NFG nano composites exhibit a localized surface plasmon resonance band at around 700 nm. Coatings of the nanocomposite form a counter electrode for efficient (8.9%) dye-sensitized solar cells. Furthermore, the nanocomposite acts as an efficient electrocatalyst for hydrogen evolution reaction, exhibiting an overpotential similar to 161 mV at a current density of 10 mA/cm(2).

1 aShanker, Shiva1 aMarkad, Ganesh, B.1 aJagadeeswararao, Metikoti1 aBansode, Umesh1 aNag, Angshuman uhttps://library.ncl.res.in/content/colloidal-nanocomposite-tin-and-n-doped-few-layer-graphene-plasmonics-and-electrocatalysis01702nas a2200145 4500008004100000245011800041210006900159260000800228300002700236490000800263520110700271100001901378700002901397856013001426 2017 eng d00aOn-axis pulsed laser deposition of hybrid perovskite films for solar cell and broadband photo-sensor applications0 aOnaxis pulsed laser deposition of hybrid perovskite films for so cAPR aArticle Number: 1331070 v1213 aHigh quality hybrid perovskite films are grown by the pulsed laser deposition (PLD) process through target stoichiometry and gas ambient control in the commonly used on-axis geometry which is compatible with PLD of other materials such as metal oxides. The use of an off-stoichiometric target and a momentum softening gas mixture of argon and hydrogen (90%:10%) is shown to yield dense films in the on-axis geometry with excellent stoichiometry and optical quality. The band gap can be easily tuned from 1.6 to 2.3 eV with either mixed halide composite target or successive depositions of inter-diffusing MAPbBr(3) and MAPbI(3) layers. A photosensor based on PLD grown MAPbI(3) is shown to render impressive performance over the broad range of wavelengths from 375 to 800 nm at a voltage of 5V bias. A planar heterojunction solar cell based on the dry-processed on-axis PLD grown film exhibits a champion conversion efficiency of 10.9%. A heterostructure comprising in situ pulsed laser deposited Cu2O (p-type) followed by the hybrid perovskite film shows a rectifying characteristic and photoresponse.1 aBansode, Umesh1 aOgale, Satishchandra, B. uhttps://library.ncl.res.in/content/axis-pulsed-laser-deposition-hybrid-perovskite-films-solar-cell-and-broadband-photo-sensor01468nas a2200193 4500008004100000245010200041210006900143260000800212300001400220490000700234520077400241100002001015700002101035700001901056700002401075700002201099700002501121856012801146 2017 eng d00aSynthetic manipulation of hybrid perovskite systems in search of new and enhanced functionalities0 aSynthetic manipulation of hybrid perovskite systems in search of cOCT a3722-37390 v103 aOver the past few years the organic-inorganic hybrid perovskite systems have emerged as a promising class of materials for photovoltaic and electroluminescent thin-film device applications, in view of their unique set of tunable optoelectronic properties. Importantly, these materials can be easily solution-processed at low temperatures and as such are amenable to facile molecular engineering. Thus, a variety of low-dimensional forms and quantum structures of these materials can be obtained through strategic synthetic manipulations through small molecule incorporation or molecular ion doping. In this Minireview, we specifically focus on these approaches and outline the possibilities of utilizing these for enhanced functionalities and newer application domains.1 aNaphade, Rounak1 aNagane, Satyawan1 aBansode, Umesh1 aTathavadekar, Mukta1 aSadhanala, Aditya1 aOgale, Satishchandra uhttps://library.ncl.res.in/content/synthetic-manipulation-hybrid-perovskite-systems-search-new-and-enhanced-functionalities06517nas a2200205 4500008004100000245012300041210006900164260000800233490000700241520576600248100002806014700002706042700001806069700001706087700002206104700001906126700002406145700002006169856012206189 2019 eng d00aWeak intermolecular interactions in covalent organic framework-carbon nanofiber based crystalline yet flexible devices0 aWeak intermolecular interactions in covalent organic frameworkca cAUG0 v113 a

The redox-active and porous structural backbone of covalent organic frameworks (COFs) can facilitate high-performance electrochemical energy storage devices. However, the utilities of such 2D materials as supercapacitor electrodes in advanced self-charging power-pack systems have been obstructed due to the poor electrical conductivity and subsequent indigent performance. Herein, we report an effective strategy to enhance the electrical conductivity of COF thin sheets through the in situ solid-state inclusion of carbon nanofibers (CNF) into the COF precursor matrix. The obtained COF-CNF hybrids possess a significant intermolecular π···π interaction between COF and the graphene layers of the CNF. As a result, these COF-CNF hybrids (DqTp-CNF and DqDaTp-CNF) exhibit good electrical conductivity (0.25 × 10–3 S cm–1), as well as high performance in electrochemical energy storage (DqTp-CNF: 464 mF cm–2 at 0.25 mA cm–2). Also, the fabricated, mechanically strong quasi-solid-state supercapacitor (DqDaTp-CNF SC) delivered an ultrahigh device capacitance of 167 mF cm–2 at 0.5 mA cm–2. Furthermore, we integrated a monolithic photovoltaic self-charging power pack by assembling DqDaTp-CNF SC with a perovskite solar cell. The fabricated self-charging power pack delivered excellent performance in the areal capacitance (42 mF cm–2) at 0.25 mA cm–2 after photocharging for 300 s.

1 aMohammed, Abdul, Khayum1 aVijayakumar, Vidyanand1 aHalder, Arjun1 aGhosh, Meena1 aAddicoat, Matthew1 aBansode, Umesh1 aKurungot, Sreekumar1 aBanerjee, Rahul uhttps://library.ncl.res.in/content/weak-intermolecular-interactions-covalent-organic-framework-carbon-nanofiber-based