Contacts

Principal Investigator

Ranjani Viswanatha

Tel #: ++91-80-22082573

Email: rv@jncasr.ac.in

 

Our Publications

 

1.  G. Krishna Murthy Grandhi and Ranjani Viswanatha Tunable Infrared Phosphors Using Cu Doping in Semiconductor Nanocrystals: Surface Electronic Structure Evaluation, J. Phys. Chem. Lett.,  4, 409 - 415 (2013). , Read abstract.  Full Paper

2.  Avijit Saha, Kishore V. Chellappan, K. S. Narayan, Jay Ghatak, Ranjan Datta and Ranjani Viswanatha Near-Unity Quantum Yield in Semiconducting Nanostructures: Structural Understanding Leading to Energy Efficient Applications, J. Phys. Chem. Lett.,  4, 3544 - 3549 (2013). ,

 Highlighted in C&E News 

, Read abstract.  Full Paper

3.  Ranjani Viswanatha and Anshu Pandey,  Optical Studies of Quantum Dots, Spectroscopic Properties of Inorganic and Organo-metallic Compounds,  44, 123 - 155 (2013). , Read abstract.

4.  Anshu Pandey, Sergio Brovelli, Ranjani Viswanatha, Liang Li, Jeffrey M. Pietryga, Victor I Klimov and Scott A. Crooker,  Long-lived photoinduced magnetization in copper-doped ZnSe–CdSe core–shell nanocrystals, Nature Nanotech.,  7, 792 - 797 (2012). ,

 Highlighted in Nature News and Views "Diluted magnetic semiconductors: Copper joins the family"

, Read abstract.  Full Paper

5.  G. Krishnamurthy Grandhi, Renu Tomar and Ranjani Viswanatha Study of Surface and Bulk Electronic Structure of II-VI Semiconductor Nanocrystals using Cu as a Nanosensor, ACS Nano,  6, 9751 - 9763 (2012). , Read abstract.  Full Paper

6.  Ranjani Viswanatha, Doron Naveh, James R. Chelikowsky, Leeor Kronik and D D Sarma,  Magnetic Properties of Fe/Cu co-doped ZnO Nanocrystals, J. Phys. Chem. Lett.,  3, 2009 - 2014 (2012). , Read abstract.  Full Paper

7.  Sergio Brovelli, Christophe Galland, Ranjani Viswanatha and Victor I. Klimov,  Tuning Radiative Recombination in Cu-doped Nanocrystals via Electrochemical Control of Surface Trapping, NanoLetters,  12, 4372 - 4379 (2012). , Read abstract.  Full Paper

8.  Ranjani. Viswanatha, Sergio. Brovelli, Anshu. Pandey, Scott. A. Crooker and Victor. I. Klimov,  Copper-Doped Inverted Core Shell Nanocrystals with Permanent Optically Active Holes, NanoLett.,  11, 4753 (2011). , Read abstract.  Full Paper

9.  Ranjani Viswanatha, Jeffrey M. Pietryga, Victor I. Klimov and Scott A. Crooker,  Spin-polarized Mn2+ emission from Mn-doped colloidal nanocrystals (Editor's Suggestion), Phys. Rev. Lett,  107, 067402 (2011). , Read abstract.  Full Paper

10.  Florencio Garcia-Santamaria, Sergio Brovelli, Ranjani Viswanatha, Jennifer A. Hollingsworth, Han. Htoon, Scott A. Crooker and Victor I. Klimov,  Breakdown of Volume Scaling in Auger Recombination in CdSe/CdS Heteronanocrystals: The Role of the Core-Shell Interface, NanoLett.,  11, 687 - 693 (2011). , Read abstract.  Full Paper

11.  Sergio Brovelli, Richard D. Schaller, Scott A. Crooker, Florencio Garcia-Santamaria, Yongfen Chen, Ranjani Viswanatha, Jennifer A. Hollingsworth, Han. Htoon and Victor I. Klimov,  New Paradigm for Controlling Exciton Dynamics Via Engineered Electron-Hole Exchange Interaction, Nature Comm.,  2, 280 (2011). , Read abstract.  Full Paper

12.  Ranjani Viswanatha, Heinz Amenitsch, Sanjita Rani Santra, Sameer Sapra, Suwarna S. Datar, Yu Zhou, Saroj K. Nayak, Sanat K. Kumar and D. D. Sarma,  Growth Mechanism of Cadmium Sulfide Nanocrystals, J. Phys. Chem. Lett.,  1, 304 - 308 (2010). , Read abstract.  Full Paper

13.  Somesh Kr Bhattacharya, Prajakta A Deodhar, Ranjani Viswanatha and Anjali Kshirsagar,  Transferrable orthogonal tight-binding parameters for ZnS and CdS, J. Phys. Condens. Matter,  22, 295304 (2010). , Read abstract.  Full Paper

14.  Pralay K. Santra, Ranjani Viswanatha, Steve M. Daniels, Nigel L. Pickett, Jason M, Smith and D. D. Sarma,  Investigation of the Internal Heterostructure of Highly Luminescent Quantum Dot-Quantum Well Nanocrystals, J. Am. Chem. Soc,  131, 470 - 477 (2009). , Read abstract.  Full Paper

15.  Ranjani Viswanatha and D. D. Sarma,  Effect of Structural Modification on the Quantum-Size Effect in II–VI Semiconducting Nanocrystals, Chem. Asian J.,  4, 904 - 909 (2009). , Read abstract.  Full Paper

16.  Dingan Chen, Ranjani Viswanatha, Grace L. Ong, Renguo Xie, Mahalingam Balasubramanian and Xiaogang Peng,  Temperature Dependence of “Elementary Processes” in Doping Semiconductor Nanocrystals, J. Am. Chem. Soc,  131, 9333 - 9339 (2009). , Read abstract.  Full Paper

17.  Ranjani Viswanatha, Pralay K. Santra and D. D. Sarma,  Self Assembly and Electronic Structure of ZnO Nanocrystals, J. Cluster Sci,  20, 389 - 398 (2009). , Read abstract.  Full Paper

18.  Cristina Graf, Andreas Hoffmann, Thomas Ackermann, Christine Boeglin, Ranjani Viswanatha, Xiaogang Peng, Arantxa Fraile Rodríguez, Frithjof Nolting and Eckart Rühl,  Magnetic and Structural Investigation of ZnSe Semiconductor Nanoparticles Doped With Isolated and Core-Concentrated Mn2+ Ions, Adv. Funct. Mater,  19, 2501 - 2510 (2009). , Read abstract.  Full Paper

19.  Ranjani Viswanatha, David M. Bhattaglia, Mark E. Curtis, Tetsuya D. Mishima, Matthew B. Johnson and Xiaogang Peng,  Shape Control of Doped Semiconductor Nanocrystals (d-Dots), Nanoresearch,  1, 138 - 144 (2008). , Read abstract.  Full Paper

20.  Ranjani Viswanatha, Heinz Amenitsch and D. D. Sarma,  Growth kinetics of ZnO nanocrystals: A few surprises, J. Am. Chem. Soc,  129, 4470 - 4475 (2007). , Read abstract.  Full Paper

21.  Ranjani Viswanatha, Sameer Sapra, Heinz Amenitsch, Barbara Satori and D. D. Sarma,  Growth of semiconducting nanocrystals of CdS and ZnS, J. Nanosci. Nanotech,  7, 1726 - 1729 (2007). , Read abstract.  Full Paper

22.  Soma Chattopadhyay, Key SD, Shibata T, Ranjani Viswanatha, Mahalingam Balasubramanian, Stoupin S, Carlo U. Segre and D. D. Sarma,  EXAFS studies of nanocrystals of Zn1-xMnxO: A dilute magnetic semiconductor oxide system, AIP Conf. Proc.,  882, 809 - 811 (2007). , Read abstract.

23.  Ranjani Viswanatha, Pralay K. Santra, Chandan Dasgupta and D. D. Sarma,  Growth mechanism of nanocrystals in solution: ZnO, a case study, Phys. Rev. Lett,  98, 255501 (2007). , Read abstract.  Full Paper

24.  Ranjani Viswanatha, S Chakraborty, S Basu and D. D. Sarma,  Blue-emitting copper-doped zinc oxide nanocrystals, J. Phys. Chem. B (Lett),  110, 22310 - 22312 (2006). , Read abstract.  Full Paper

25.  Ranjani Viswanatha and D. D. Sarma,  Study of the growth of capped ZnO nanocrystals: A route to rational synthesis, Chem-Euro. J,  12, 180 - 186 (2006). , Read abstract.  Full Paper

26.  Ranjani Viswanatha, Sameer Sapra, Tanusri Saha-Dasgupta and D. D. Sarma,  Electronic structure of and quantum size effect in III-V and II-VI semiconducting nanocrystals using a realistic tight binding approach, Phys. Rev. B,  72, 045333 (2005). , Read abstract.  Full Paper

27.  Debangshu Chaudhuri, Suwarna S. Datar, Ranjani Viswanatha, D. D. Sarma and Heinz Amenitsch,  Self-organization of polyaniline nanorods: Towards achieving a higher conductivity, Appl. Phys. Lett,  87, 093117 (2005). , Read abstract.  Full Paper

28.  D. D. Sarma, Ranjani Viswanatha, Sameer Sapra, Ankita Prakash and M. Garcia-Hernandez,  Magnetic properties of doped II-VI semiconductor nanocrystals, J. Nanosci. Nanotech,  5, 1503 - 1508 (2005). , Read abstract.  Full Paper

29.  Sameer Sapra, Ranjani Viswanatha and D. D. Sarma,  Electronic structure of semiconductor nanocrystals: An accurate tight-binding description, Int. J. Nanosci.,  4, 893 - 899 (2005). , Read abstract.  Full Paper

30.  Ranjani Viswanatha, Sameer Sapra, B. Satpati, P. V. Satyam, B. N. Dev and D. D. Sarma,  Understanding the quantum size effects in ZnO nanocrystals, J. Mater. Chem,  14, 661 - 668 (2004). , Read abstract.  Full Paper

31.  Ranjani Viswanatha, Sameer Sapra, Subhra Sen Gupta, B. Satpati, P. V. Satyam, B. N. Dev and D. D. Sarma,  Synthesis and characterization of Mn-doped ZnO nanocrystals, J. Phys. Chem. B,  108, 6303 - 6310 (2004). , Read abstract.  Full Paper

32.  Sameer Sapra, Ranjani Viswanatha and D. D. Sarma,  An accurate description of quantum size effects in InP nanocrystallites over a wide range of sizes, J. Physics D: App. Phys,  36, 1595 - 1598 (2003). , Read abstract.  Full Paper

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