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Institution

Indian Association for the Cultivation of Science

EducationKolkata, India
About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Excited state & Catalysis. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.
Topics: Excited state, Catalysis, Ligand, Thin film, Band gap


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors synthesize gold nanoparticles of different shapes by in situ reduction within the structure-directing low molecular weight gel template of tryptophan-containing peptide amphiphiles in water without using any external reducing or capping agents.
Abstract: We have synthesized the gold nanoparticles (GNPs) of different shaped by in situ reduction within the structure-directing low molecular weight gel template of tryptophan-containing peptide amphiphiles in water without using any external reducing or capping agents. Gold nanocrystals with sheet, wire, octahedral, and decahedral shapes were modulated with the help of the different morphology of the supramolecular gel network. The gel morphology at minimum gelation concentration is the prime requirement to prepare such different nanocrystals of gold. We also elucidated that the seeding growth approach did not have any stimulating affect to control the shape of GNPs. The supramolecular template itself has the structure-directing capability. The formation of gold species in the aqueous solution was monitored by UV−vis spectroscopy, transmission electron microscopy, and X-ray diffraction studies. The tryptophan-based peptide hydrogelators are elegant hosts as structure-directing templates for in situ shape-contr...

100 citations

Journal ArticleDOI
TL;DR: Density functional theoretical (DFT) calculations provide the ground- and excited-state energy optimized structures and properties of the proposed aluminum complex [Al(1) (OH)]2(2+), which is in harmony with the solution-state experimental findings and also supports the occurrence of ESIPT process in 1H.
Abstract: An excited-state intramolecular proton transfer (ESIPT)-based highly sensitive ratiometric fluorescence sensor, 1H was developed for selective detection of aluminum (Al3+) in acetonitrile as well as in 90% aqueous system. Single-crystal X-ray diffraction analysis reveals almost planar and conjugated structure of 1H. Photophysical properties of the sensor as well as its selectivity toward Al3+ are explored using UV–visible, steady-state, and time-resolved fluorescence spectroscopic studies. The bright cyan (λem = 445 nm) fluorescence of 1H in acetonitrile turns into deep blue (λem = 412 nm) with ∼2.3-fold enhancement in emission intensity, in the presence of parts per billion level Al3+ (detection limit = 0.5 nM). Interestingly, the probe 1H exhibits increased selectivity toward Al3+ in H2O/acetonitrile (9:1 v/v) solvent system with a change in fluorescence color from pale green to deep blue associated with ca. sixfold enhancement in emission intensity. Density functional theoretical (DFT) calculations pro...

100 citations

Journal ArticleDOI
23 Sep 1999-Langmuir
TL;DR: In this article, the hydrodynamic diameter, diffusion coefficient, and the polydispersity index of the colloidal dispersions prepared in the absence and presence of gelatin at different ω have been determined by the dynamic light scattering method; the static light scatter method has been employed to estimate the average particle weight of the dispersion.
Abstract: Colloidal dispersions of Cu2[Fe (CN)6] have been prepared in the nanodomain water pools of water/AOT/n-heptane water-in-oil microemulsion at various [water]/[AOT] mole ratios, ω, by reacting CuSO4 with K4[Fe(CN)6]. The UV−visible absorption spectra of the isotropic molecular aggregates of Cu2[Fe(CN)6] surrounded by a layer of amphiphile AOT have been measured. The hydrodynamic diameter, diffusion coefficient, and the polydispersity index of the colloidal dispersions prepared in the absence and presence of gelatin at different ω have been determined by the dynamic light scattering method; the static light scattering method has been employed to estimate the average particle weight of the dispersion. The formation of Cu2[Fe(CN)6] in the dispersion has been established by X-ray diffraction measurements. The size and shape of the colloidal dispersions and the isolated particles have been examined by the transmission electron microscopy and scanning electron microscopy methods. The enthalpies of formation of Cu...

100 citations

Journal ArticleDOI
TL;DR: In this article, an emulsion technique under mechanical agitation without the aid of any surface-active agent was used to prepare spheroidal indium tin oxide (ITO) nano-particles with In/Sn=85:15 (at.

100 citations

Journal ArticleDOI
TL;DR: Synthesis and characterization of undoped and Mn2+ doped ZnS nanocrystallites (radius 2-3 nm) embedded in a partially densified silica gel matrix are presented in this paper.
Abstract: Synthesis and characterization of undoped and Mn2+ doped ZnS nanocrystallites (radius 2–3 nm) embedded in a partially densified silica gel matrix are presented. Optical transmittance, photoluminescence (PL), ellipsometric and electron spin resonance measurements revealed manifestation of quantum size effect. PL spectra recorded at room temperature revealed broad blue emission signal centred at ∼ 420 nm and Mn2+ related yellow-orange band centred at ∼ 590 nm while ESR indicated that Mn in ZnS was present as dispersed impurity rather than Mn cluster.

99 citations


Authors

Showing all 3900 results

NameH-indexPapersCitations
Yves Pommier12378958898
Flemming Besenbacher11472851827
Katsuhiko Ariga11286445242
Shunichi Fukuzumi111125652764
Rajdeep Mohan Chatterjee11099051407
Kwang S. Kim9764262053
Amar K. Mohanty8153831856
Nigel D. Browning8164623621
Andrea Caneschi8043525896
Rodolphe Clérac7850622604
Subrata Ghosh7884132147
Miaofang Chi7730422817
Yuan Ping Feng7765025846
D. D. Sarma7052118082
Asim Bhaumik6946616882
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202310
202283
2021443
2020447
2019452
2018467