01591nas a2200253 4500008004100000022001400041245014200055210006900197260011000266300001400376490000600390520058900396100001900985700002401004700002401028700002101052700001801073700002001091700002401111700002301135700002301158700002901181856012701210 2012 eng d a2040-336400aLaser synthesized super-hydrophobic conducting carbon with broccoli-type morphology as a counter-electrode for dye sensitized solar cells0 aLaser synthesized superhydrophobic conducting carbon with brocco aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcNOV a6730-67340 v43 a

A laser photochemical process is introduced to realize superhydrophobic conducting carbon coatings with broccoli-type hierarchical morphology for use as a metal-free counter electrode in a dye sensitized solar cell. The process involves pulsed excimer laser irradiation of a thin layer of liquid haloaromatic organic solvent o-dichlorobenzene (DCB). The coating reflects a carbon nanoparticle-self assembled and process-controlled morphology that yields solar to electric power conversion efficiency of 5.1% as opposed to 6.2% obtained with the conventional Pt-based electrode.

1 aGokhale, Rohan1 aAgarkar, Shruti, A.1 aDebgupta, Joyashish1 aShinde, Deodatta1 aLefez, Benoit1 aBanerjee, Abhik1 aJog, Jyoti, Prakash1 aMore, Mahendra, A.1 aHannoyer, Beatrice1 aOgale, Satishchandra, B. uhttp://library.ncl.res.in/content/laser-synthesized-super-hydrophobic-conducting-carbon-broccoli-type-morphology-counter-001765nas a2200157 4500008004100000245009700041210006900138260000800207300001800215490000600233520117000239100002801409700002301437700002401460856012301484 2016 eng d00aLaser exfoliation of 2D black phosphorus nanosheets and their application as a field emitter0 aLaser exfoliation of 2D black phosphorus nanosheets and their ap cNOV a112103-1121080 v63 aHighly crystalline two dimensional (2D) few layered black phosphorus (BP) nanosheets have been synthesized via a one step facile laser irradiation technique under optimized experimental conditions. The field emission investigations on the few layered black phosphorus nanosheets were carried out at the base pressure 1 x 10(-8) mbar. The morphological, elemental, optical, and structural analysis of the as-synthesized black phosphorus sample was carried out using SEM, AFM, EDAX, TEM, and Raman spectroscopy. The turn-on values of the BP nanosheets emitter were found to be significantly lower than that of earlier reports of BP nanosheets, graphene, and carbon nanotubes based field emitters due to the high field enhancement factor (beta) similar to 2986 associated with atomically thin/sharp edges of the BP nanosheets emitter. The emission current versus time plot depicts the good emission current stability with a pre-set value of 1 mu A for similar to 5 h duration. Our facile synthesis approach and the robust field emitter nature of the BP nanosheets makes them a potential candidate for a practical electron source in vacuum micro/nanoelectronic devices.1 aSuryawanshi, Sachin, R.1 aMore, Mahendra, A.1 aLate, Dattatray, J. uhttp://library.ncl.res.in/content/laser-exfoliation-2d-black-phosphorus-nanosheets-and-their-application-field-emitter02444nas a2200217 4500008004100000022001400041245009300055210006900148260011000217300001400327490000600341520159700347100002801944700002001972700002401992700001802016700002302034700002402057700002102081856012402102 2016 eng d a2050-752600aLow frequency noise and photo-enhanced field emission from ultrathin PbBi2Se4 nanosheets0 aLow frequency noise and photoenhanced field emission from ultrat aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcDEC a1096-11030 v43 a

Atomically thin two-dimensional layered materials have gained wide interest owing to their novel properties and potential for applications in nanoelectronic and optoelectronic devices. Here, we present the spectral analysis and photo-enhanced field emission studies of a layered intergrowth PbBi2Se4 nanosheet emitter, performed at the base pressure of similar to 1 x 10(-8) mbar. The emitter shows a turn-on field value of similar to 4.80 V mu m(-1), corresponding to an emission current density of similar to 1 mu A cm(-2). Interestingly, when the cathode was illuminated with visible light, it exhibited a lower turn-on field of B3.90 V mm(-1), and a maximum emission current density of similar to 893 mu A cm(-2) has been drawn at an applied electric field of similar to 8.40 V mu m(-1). Furthermore, the photo-enhanced emission current showed reproducible, step-like switching behavior in synchronous with ON-OFF switching of the illumination source. The emission current-time plots reveal excellent stability over a duration of similar to 6 h. Low-frequency noise is a significant limitation for the performance of nanoscale electronic devices. The spectral analysis performed on a Fast Fourier Transform (FFT) analyzer revealed that the observed noise is of 1/f(alpha) type, with the value of alpha similar to 0.99. The low frequency noise, photo-enhanced field emission, and reproducible switching behavior characterized with very fast rise and fall times propose the layered PbBi2Se4 nanosheet emitter as a new promising candidate for novel vacuum nano-optoelectronic devices.

1 aSuryawanshi, Sachin, R.1 aGuin, Satya, N.1 aChatterjee, Arindom1 aKashid, Vikas1 aMore, Mahendra, A.1 aLate, Dattatray, J.1 aBiswas, Kanishka uhttp://library.ncl.res.in/content/low-frequency-noise-and-photo-enhanced-field-emission-ultrathin-pbbi2se4-nanosheets-001341nas a2200193 4500008004100000245009000041210006900131260000800200300001400208490000800222520066200230100002200892700002000914700002600934700002400960700002300984700002501007856011501032 2016 eng d00aLow turn-on field and high field emission current density from Ag/TiO 2 nanocomposite0 aLow turnon field and high field emission current density from Ag cJUL a167–1710 v6573 a

High current density of 1.24 mA/cm2 was drawn at an applied field of 4.4 V/μm from Ag/TiO2 nanocomposite. Also the turn-on field has been reduced from 3.9 V/μm to 2.7 V/μm for the emission current density of 10 μA/cm2. Ag/TiO2 nanocomposite was synthesized by using UV-switchable reducing agent. TiO2 nanotube wall was decorated by Ag nanoparticles with average diameter of 17 nm. To the best of our knowledge this is the first report on the field emission studies of Ag/TiO2 nanocomposite. Simple synthesis route coupled with superior field emission properties indicate the possible use of Ag/TiO2 nanocomposite for micro/nanoelectronic devices.

1 aPatil, Girish, P.1 aDeore, Amol, B.1 aBagal, Vivekanand, S.1 aLate, Dattatray, J.1 aMore, Mahendra, A.1 aChavan, Padmakar, G. uhttp://library.ncl.res.in/content/low-turn-field-and-high-field-emission-current-density-agtio-2-nanocomposite