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Debgupta J.,CSIR - National Chemical Laboratory | Devarapalli R.,CSIR - National Chemical Laboratory | Devarapalli R.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | Rahman S.,CSIR - National Chemical Laboratory | And 5 more authors.
Nanoscale | Year: 2014

Vertically aligned, hollow nanotubes of CdSe are grown on fluorine doped tin oxide (FTO) coated glass substrates by ZnO nanowire template-assisted electrodeposition technique, followed by selective removal of the ZnO core using NH4OH. A detailed mechanism of nucleation and anisotropic growth kinetics of nanotubes have been studied by a combination of characterization tools such as chronoamperometry, SEM and TEM. Interestingly, "as grown" CdSe nanotubes (CdSe NTs) on FTO coated glass plates behave as n-type semiconductors exhibiting an excellent photo-response (with a generated photocurrent density value of ∼470 μA cm-2) while in contact with p-type Cu2O (p-type semiconductor, grown separately on FTO plates) because of the formation of a n-p heterojunction (type II). The observed photoresponse is 3 times higher than that of a similar device prepared with electrodeposited CdSe films (not nanotubes) and Cu2O on FTO. This has been attributed to the hollow 1-D nature of CdSe NTs, which provides enhanced inner and outer surface areas for better absorption of light and also assists faster transport of photogenerated charge carriers. This journal is © the Partner Organisations 2014.

Saha S.,Indian Central Mechanical Engineering Research Institute | Saha S.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | Jana M.,Indian Central Mechanical Engineering Research Institute | Jana M.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | And 3 more authors.
Journal of Materials Chemistry A | Year: 2015

In situ electro-deposition, reduction and functionalization of graphene oxide (GO) with sulfanilic acid azocromotrop (SAC) were carried out through a facile one-step electrochemical method. Nickel foam was used as the anode during the electro-deposition and the aqueous solution of SAC along with GO was used as the electrolyte. The SAC modified reduced GO (RGO) was deposited on the nickel foam (SAC-RGO@Ni) and was directly used as the electrode for capacitive property analysis. The reduction and functionalization of GO were examined by Fourier transform infrared (FT-IR), Raman and X-ray photoelectron spectroscopy (XPS) techniques. The SAC-RGO@Ni provides a very high specific capacitance of ∼1090 F g-1 due to the synergistic effect of double layer capacitance of RGO and the pseudocapacitance of -SO3H functionalities of SAC. An asymmetric supercapacitor (ASC) cell was designed with SAC-RGO@Ni and thermally reduced GO (TRGO) as positive and negative electrodes, respectively. The ASC device exhibits a high effective capacitance of ∼495 F g-1 at a current density of 10 A g-1 and ∼93% of its total discharging time lies in-between 1.5 and 0.75 V. The ASC cell remains stable up to 10000 charge-discharge cycles. Furthermore, the SAC-RGO@Ni-based ASC device can provide a very high energy density of ∼88.9 W h kg-1 and a large power density of 16500 W kg-1 ensuring its applicability in high power consumption devices. © The Royal Society of Chemistry 2015.

Ramachandran G.,Vellore Institute of Technology | Ramachandran G.,Indian Institute of Science | Raman A.,CSIR - Central Leather Research Institute | Raman A.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | And 4 more authors.
RSC Advances | Year: 2014

A series of new dimeric tetracyclic dilactam fluorophores (DTDF) consisting of diazabicyclooctane-dione (DBOD) fused to tetrahydronaphthalene (THP) was designed and synthesized from a simple precursor. The monomers showed enhanced emission in THF-water solvent and also benzene-dimer like absorption and fluorescence, originating from the hydrogen-bonding aided self-assembly of dilactams. The crystal structures revealed water-mediated molecular aggregates with several hydrogen-bond bridges formed by water. © 2014 The Royal Society of Chemistry.

Velmurugan K.,Karunya University | Raman A.,CSIR - Central Leather Research Institute | Raman A.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | Don D.,Karunya University | And 4 more authors.
RSC Advances | Year: 2015

A quinoline benzimidazole-conjugate (QBC) has been synthesized for the highly selective detection of Zn(ii) both by colorimetry and fluorimetry. Probe QBC senses Zn2+ over other cations as fluorescence 'off-on' behaviour in HEPES-buffered CH3CN-H2O (1:1, v/v, pH = 7.0) solution. A possible mechanism is proposed based on the inhibition of PET and intramolecular restricted torsional rotation through the C-C single bond between the quinoline benzimidazole-conjugate. The Chemosensor is utilized to detect Zn2+ in much real sample analysis. This journal is © The Royal Society of Chemistry 2015.

Prasad Y.D.,CSIR - Central Electrochemical Research Institute | Chhonker Y.S.,CSIR - Central Electrochemical Research Institute | Chhonker Y.S.,Academy of Scientific and Innovative Research AcSIR Anusandhan Bhawan | Chandasana H.,CSIR - Central Electrochemical Research Institute | And 9 more authors.
Analytical Methods | Year: 2015

Fluoxetine is a commonly prescribed antidepressant agent in psychotherapy. A rapid, selective and sensitive LC-MS/MS method was developed and validated for simultaneous estimation of fluoxetine and its metabolite nor-fluoxetine in rabbit and human plasma. The assay was linear over the concentration range of 0.048-100 ng mL-1 with a lower limit of detection of 32 pg mL-1 (0.032 ng mL-1) for both fluoxetine and nor-fluoxetine. Separation and detection of analytes were achieved on a reversed phase Waters Symmetry Shield™ C18 column, with an isocratic mobile phase consisting of methanol and 0.5% formic acid (80:20, v/v) at a flow rate of 0.75 mL min-1. A turnover rate of 2.5 min per sample enables the high-throughput bioanalysis of fluoxetine. An automated solid phase extraction method was employed for efficient extraction of analytes from the matrix. Thereafter, analytes were monitored by using MS/MS with an electrospray ionization source in positive multiple reaction monitoring mode. The method was successfully applied to in vivo pharmacokinetic studies in rabbit and in vitro protein binding studies in human plasma. Due to high sensitivity and low requirement of sample volume, the method could be applicable for preclinical and clinical applications such as therapeutic drug monitoring in special population (children and geriatric patients) using only 0.03 mL of plasma. © 2015 The Royal Society of Chemistry.

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