01839nas a2200193 4500008004100000022001400041245010600055210006900161260007100230300001600301490000800317520107100325100002501396700002101421700002301442700002201465700003001487856012801517 2007 eng d a1932-744700aTemplate-assisted synthesis of ruthenium oxide nanoneedles: electrical and electrochemical properties0 aTemplateassisted synthesis of ruthenium oxide nanoneedles electr a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcNOV a16593-166000 v1113 a

We here demonstrate the formation of bundles of RuO2 nanoneedles (ca. 100 nm diameter) by a templateassisted electrodeposition from aqueous RuCl3 solution under potentiostatic conditions at room temperature. Cyclic voltammetric measurements in 0.5 M H2SO4 show significantly higher redox-related charging behavior for the RuO2 nanoneedles compared to that of the commercial sample, which is also supported by the electrochemical impedance data. A comparison of the specific capacitance reveals a higher value for nanoneedles (3 F/g instead of 0.4 F/g for the bulk), which has been explained on the basis of enhanced reactivity. More interestingly, electrical transport measurements reveal a transition from metallic to semiconducting behavior especially at low-temperature caused by an impurity scattering mechanism. We anticipate that the present simple route for the fabrication of RuO2 nanostructures will be useful to exploit their potentials in various fields such as electrocatalysis, nanoelectronics, and more importantly for designing supercapacitors.

1 aSubhramannia, Mahima1 aBalan, Beena, K.1 aSathe, Bhaskar, R.1 aMulla, Imtiaz, S.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/template-assisted-synthesis-ruthenium-oxide-nanoneedles-electrical-and-electrochemical-002473nas a2200169 4500008004100000022001400041245012700055210006900182260007100251300001400322490000700336520175100343100002502094700002802119700003002147856012602177 2008 eng d a0024-929700aTuning the transport properties of Poly(oxyethylene)bisamine - Nafion polyelectrolyte complexes by dielectric manipulation0 aTuning the transport properties of Polyoxyethylenebisamine Nafio a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAY a3653-36580 v413 a

Polyelectrolyte complexes (PECs) of Nafion-H+, a perfluorosulfonic acid ionomer, and Poly(oxyethylene)bisamine (Polyox) were synthesized, and the effect of electrostatic interactions on the physicochemical properties of the individual components was studied using a combination of spectroscopic and electrochemical techniques. More specifically, the pristine PECs were extensively characterized using viscosity, surface tension, and pH measurements and diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy and their transport properties were investigated using cyclic voltammetry and electrochemical impedance spectroscopy, by employing [Fe(CN)(6)](3-) as a redox probe. Acid-base interaction between Nafion and Polyox is evident from pH measurements of the blend solutions, which indicate salt formation at a 50:50 composition, supported further by the existence of a maximum in the plot of surface tension versus blend composition. DRIFT spectra of the PEC membranes indicate subtle changes in the ionic environment and a transition from a state of medium hydration to a partially dehydrated state of the parent ionomer, Nation, after complexation with Polyox. Further evidence for polyelectrolyte-polyelectrolyte association is obtained from cyclic voltammetry, which shows that the interaction between the redox active chromophore, [Fe(CN)(6)](3-), and the pendent sulfonate groups of Nafion is minimized by complexation with the oppositely charged polyelectrolyte Polyox. The water-soluble nature of these PECs along with the tunable range of properties with blend composition could qualify them as suitable candidates for developing stimuli-responsive polymer systems for pharmaceutical and environmental applications.

1 aParthasarathy, Meera1 aKakade, Bhalchandra, A.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/tuning-transport-properties-polyoxyethylenebisamine-nafion-polyelectrolyte-complexes-001380nas a2200157 4500008004100000022001400041245009500055210006900150260007100219300001400290490000800304520073000312100002801042700003001070856012201100 2008 eng d a1932-744700aTuning the wetting properties of multiwalled carbon nanotubes by surface functionalization0 aTuning the wetting properties of multiwalled carbon nanotubes by a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR a3183-31860 v1123 a

A simple strategy of chemical functionalization is employed here for controlling the wettability of multiwalled carbon nanotube films from superhydorphobic (156 degrees) to nearly hydrophilic (40 degrees), which further shows superhydrophilicity with a water contact angle of about 0 degrees within 2 s. The hydrophobic surface (water contact angle 145 degrees) in case of nitric-acid-treated MWCNT bucky paper shows an unusual pinning action even at a tilt angle of 45 degrees, following Wenzel behavior of the surface. The variation in the wetting properties of MWCNT bucky paper using such surface designing strategies provides controlled heterogeneity on the surface with no or minimal effect on surface roughness.

1 aKakade, Bhalchandra, A.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/tuning-wetting-properties-multiwalled-carbon-nanotubes-surface-functionalization-001025nas a2200157 4500008004100000022001400041245010000055210006900155260011000224300001400334490000600348520033400354100002400688700003000712856012500742 2013 eng d a2040-336400aThiolated graphene - a new platform for anchoring CdSe quantum dots for hybrid heterostructures0 aThiolated graphene a new platform for anchoring CdSe quantum dot aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR a3615-36190 v53 a

Effective organization of small CdSe quantum dots on graphene sheets has been achieved by a simple solution exchange with thiol terminated graphene prepared by diazonium salt chemistry. This generic methodology of CdSe QD attachment to any graphene surface has remarkable implications in designing hybrid heterostructures.

1 aDebgupta, Joyashish1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/thiolated-graphene-new-platform-anchoring-cdse-quantum-dots-hybrid-heterostructures-0