Research Papers

Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy

[+] Author Affiliations
Syed Abuthahir Ziaudeen

Central Electro Chemical Research Institute, CSIR, Karaikudi, Tamil Nadu 630 006, India

Dr. Zakir Husain College, Ilayangudi, Tamil Nadu 630 702, India

Rohit Ranganathan Gaddam

Central Electro Chemical Research Institute, CSIR, Karaikudi, Tamil Nadu 630 006, India

Amity University, Amity Institute of Nanotechnology, Noida, Uttar Pradesh 201 301, India

Praveen Kumar Pallapothu

Central Electro Chemical Research Institute, CSIR, Karaikudi, Tamil Nadu 630 006, India

Amity University, Amity Institute of Nanotechnology, Noida, Uttar Pradesh 201 301, India

Manoj Krishna Sugumar

Central Electro Chemical Research Institute, CSIR, Karaikudi, Tamil Nadu 630 006, India

Amity University, Amity Institute of Nanotechnology, Noida, Uttar Pradesh 201 301, India

Jagannathan Rangarajan

Central Electro Chemical Research Institute, CSIR, Karaikudi, Tamil Nadu 630 006, India

J. Nanophoton. 7(1), 073075 (Dec 17, 2013). doi:10.1117/1.JNP.7.073075
History: Received October 15, 2013; Revised November 22, 2013; Accepted November 25, 2013
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Abstract.  Nanostructures of lead sulfide (Eg0.67 to 1.7 eV) corresponding to different quantum confinement regimes (weak, moderate, and strong with radii 14, 11, and 7 nm, respectively) have been synthesized through facile aqueous colloidal method and have been capped using poly vinyl alcohol. There is a marked difference in electron-lattice coupling properties as revealed through Fourier transform infrared data with strong quantum confined PbS quantum dots (QDs) exhibiting pronounced electron-lattice coupling characteristics. Opto-impedance characteristics of these samples suggest the enhanced mobility of charges, in particular under the supra gap excitation for strong quantum confined QDs.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Syed Abuthahir Ziaudeen ; Rohit Ranganathan Gaddam ; Praveen Kumar Pallapothu ; Manoj Krishna Sugumar and Jagannathan Rangarajan
"Supra gap excitation properties of differently confined PbS-nano structured materials studied with opto-impedance spectroscopy", J. Nanophoton. 7(1), 073075 (Dec 17, 2013). ; http://dx.doi.org/10.1117/1.JNP.7.073075


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