Santra, Pralay K, Viswanatha, Ranjani, Daniels, Steve M, Pickett, Nigel L, Smith, Jason M, O'Brien, Paul, ...
In this paper, we report on the growth and characterization of quantum dot−quantum well nanostructures with photoluminescence (PL) that is tunable over the visible range. The material exhibits a PL...
Viswanatha, Ranjani, Sarma, DD
The electronic structure of group II-VI semiconductors in the stable wurtzite form is analyzed using state-of-the-art ab initio approaches to extract a simple and chemically transparent tight-binding...
Growth mechanism of nanocrystals in solution: ZnO, a case study (2007)
Viswanatha, Ranjani, Santra, Pralay K., Dasgupta, Chandan, Sarma, D. D.
We investigate the mechanism of growth of nanocrystals from solution using the case of ZnO. Spanning a wide range of values of the parameters, such as the temperature and the reactant concentration,...
Growth Mechanism of Nanocrystals in Solution: ZnO, a Case Study (2007)
Viswanatha, Ranjani, Santra, Pralay K, Dasgupta, Chandan, Sarma, D. D
We investigate the mechanism of growth of nanocrystals from solution using the case of ZnO. Spanning a wide range of values of the parameters, such as the temperature and the reactant concentration...
Growth Mechanism of Nanocrystals in Solution: ZnO, a Case Study (2007)
Viswanatha, Ranjani, Santra, Pralay K, Dasgupta, Chandan, Sarma, DD
We investigate the mechanism of growth of nanocrystals from solution using the case of ZnO. Spanning a wide range of values of the parameters, such as the temperature and the reactant concentration...
Growth of semiconducting nanocrystals of CdS and ZnS (2007)
Viswanatha, Ranjani, Sapra, Sameer, Amenitsch, Heinz, Sartori, Barbara, Sarma, D. D.
In this work, we report the study of growth of CdS as well as ZnS nanocrystals using in-situ small angle X-ray scattering (SAXS) technique, in presence of thio-glycerol as capping agent. We observe...
Growth Kinetics of ZnO Nanocrystals: A Few Surprises (2007)
Viswanatha, Ranjani, Amenitsch, Heinz, Sarma, DD
Using extensive state-of-the-art experiments over a wide range of synthesis parameters, such as the temperature and concentrations of different reactants, we establish qualitatively different growth...
Growth Kinetics of ZnO Nanocrystals: A Few Surprises (2007)
Viswanatha , Ranjani, Amenitsch, Heinz, Sarma, D. D
Using extensive state-of-the-art experiments over a wide range of synthesis parameters, such as the temperature and concentrations of different reactants, we establish qualitatively different growth...
Growth Kinetics of ZnO Nanocrystals: A Few Surprises (2007)
Viswanatha, Ranjani, Amenitsch, Heinz, DD, Sarma
Using extensive state-of-the-art experiments over a wide range of synthesis parameters, such as the temperature and concentrations of different reactants, we establish qualitatively different growth...
Growth Mechanism of Nanocrystals in Solution: ZnO, a Case Study (2007)
Viswanatha, Ranjani, Santra, Pralay K, Dasgupta, Chandan, Sarma, DD
We investigate the mechanism of growth of nanocrystals from solution using the case of ZnO. Spanning a wide range of values of the parameters, such as the temperature and the reactant concentration...
Properties of nanocrystals are extremely sensitive to their sizes when their sizes are smaller or of the order of the excitonic diameter due to the quantum confinement effect. The interest in this...
Properties of nanocrystals are extremely sensitive to their sizes when their sizes are smaller or of the order of the excitonic diameter due to the quantum confinement effect. The interest in this...
Study of the Growth of Capped ZnO Nanocrystals: A Route to Rational Synthesis (2006)
Viswanatha, Ranjani, Sarma, DD
We report the study of complex and unexpected dependencies of nanocrystal size as well as nanocrystal-size distribution on various reaction parameters in the synthesis of ZnO nanocrystals using...
Study of the Growth of Capped ZnO Nanocrystals: A Route to Rational Synthesis (2006)
Viswanatha, Ranjani, Sarma, DD
We report the study of complex and unexpected dependencies of nanocrystal size as well as nanocrystal-size distribution on various reaction parameters in the synthesis of ZnO nanocrystals using...
Study of the Growth of Capped ZnO Nanocrystals: A Route to Rational Synthesis (2005)
Viswanatha, Ranjani, Sarma, D. D
We report the study of complex and unexpected dependencies of nanocrystal size as well as nanocrystal-size distribution on various reaction parameters in the synthesis of ZnO nanocrystals using...
Magnetic Properties of Doped II-VI Semiconductor Nanocrystal (2005)
Sarma, DD, Viswanatha, Ranjani, Sapra, Sameer, Prakash, Ankita, Garcia-Hernandez, M
We investigate the magnetic properties of two typical II VI semiconducting nanocrystals, namely, ZnS and ZnO, doped with various concentrations of a transition metal ion, Mn. A wide range of dopant...
Self-organization of polyaniline nanorods: Towards achieving a higher conductivity (2005)
Chaudhuri, Debangshu, Datar, Suwarna, Viswanatha, Ranjani, Sarma, DD, Amenitsch, Heinz
We present a scanning tunnelling microscopy and spectroscopy study of polyaniline nanostructure. Our results show the possibility of achieving a high degree of self-organization in polyaniline...
Viswanatha, Ranjani, Sapra, Sameer, Saha-Dasgupta, Tanusri, Sarma, DD
We analyze the electronic structure of group III-V semiconductors obtained within full potential linearized augmented plane wave(FP-LAPW) method and arrive at a realistic and minimal tight-binding...
Viswanatha, Ranjani, Sapra, Sameer, Saha-Dasgupta, Tanusri, Sarma, D. D.
We analyze the electronic structure of group III-V semiconductors obtained within full potential linearized augmented plane wave (FP-LAPW) method and arrive at a realistic and minimal tight-binding...
Viswanatha, Ranjani, Sapra, Sameer, Saha-Dasgupta, Tanusri, Sarma, DD
We analyze the electronic structure of group III-V semiconductors obtained within full potential linearized augmented plane wave(FP-LAPW) method and arrive at a realistic and minimal tight-binding...
Self-organization of polyaniline nanorods: Towards achieving a higher conductivity (2005)
Chaudhuri, Debangshu, Datar, Suwarna, Viswanatha, Ranjani, Sarma, DD, Amenitsch, Heinz
We present a scanning tunnelling microscopy and spectroscopy study of polyaniline nanostructure. Our results show the possibility of achieving a high degree of self-organization in polyaniline...
Magnetic Properties of Doped II-VI Semiconductor Nanocrystal (2005)
Sarma, DD, Viswanatha, Ranjani, Sapra, Sameer, Prakash, Ankita, Garcia-Hernandez, M
We investigate the magnetic properties of two typical II VI semiconducting nanocrystals, namely, ZnS and ZnO, doped with various concentrations of a transition metal ion, Mn. A wide range of dopant...
Synthesis and Characterization of Mn-Doped ZnO Nanocrystals (2004)
Viswanatha, Ranjani, Sapra, Sameer, Gupta, Subhra Sen, Satpati, B, Satyam, PV, Dev, BN, ...
We report the synthesis and characterization of several sizes of Mn-doped ZnO nanocrystals, both in the free-standing and the capped particle forms. The sizes of these nanocrystals could be...
Synthesis and Characterization of Mn-Doped ZnO Nanocrystals (2004)
Viswanatha, Ranjani, Sapra, Sameer, Gupta, Subhra Sen, Satpati, B, Satyam, PV, Dev, BN, ...
We report the synthesis and characterization of several sizes of Mn-doped ZnO nanocrystals, both in the free-standing and the capped particle forms. The sizes of these nanocrystals could be...
Understanding the quantum size effects in ZnO nanocrystals (2004)
Viswanatha, Ranjani, Sapra, Sameer, Satpati, B, Satyam, PV, Dev, BN, Sarma, DD
In the present work, we report the synthesis of high quality ZnO nanocrystals with sharp absorption edges in four different sizes, namely 3.0, 3.5, 4.7 and 5.4 nm, characterized by X-ray and electron...
Understanding the quantum size effects in ZnO nanocrystals (2004)
Viswanatha, Ranjani, Sapra, Sameer, Satpati, B, Satyam, PV, Dev, BN, Sarma, DD
In the present work, we report the synthesis of high quality ZnO nanocrystals with sharp absorption edges in four different sizes, namely 3.0, 3.5, 4.7 and 5.4 nm, characterized by X-ray and electron...
Sapra, Sameer, Viswanatha, Ranjani, Sarma, D. D.
We obtain an effective parametrization of the bulk electronic structure of InP within the Tight Binding scheme. Using these parameters, we calculate the electronic structure of InP clusters with the...