Journal of nanoscience, nanoengineering & applications (vol4, issue2) by STM Journals Publication

Journal of Nanoscience, Nanoengineering & Applications (JoNSNEA)

May - August 2014

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ISSN: 2321-5194

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Dr. Rakesh Kumar Dept. of Applied Chemistry BIT Mesra, Patna Campus, Patna, India.

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STM JOURNALS

I take the privilege to present the hard copy compilation for the [Volume 4 Issue (2)] of Journal of NanoScience, NanoEngineering & Applications (JoNSNEA). The intension of JoNSNEA is to create an atmosphere that stimulates creativeness, research and growth in the area of NanoScience , NanoEngineering & Applications. The development and growth of the mankind is the consequence of brilliant Research done by eminent Scientists and Engineers in every field. JoNSNEA provides an outlet for Research findings and reviews in areas of NanoScience , NanoEngineering & Applications found to be relevant for National and International recent developments & research initiatives. The aim and scope of the Journal is to provide an academic medium and an important reference for the advancement and dissemination of Research results that support high level learning, teaching and research in the domain of NanoScience, NanoEngineering & Applications. Finally, I express my sincere gratitude and thanks to our Editorial/ Reviewer board and Authors for their continued support and invaluable contributions and suggestions in the form of authoring writeups/ reviewing and providing constructive comments for the advancement of the journals. With regards to their due continuous support and co-operation, we have been able to publish quality Research/Review findings for our customers base. I hope you will enjoy reading this issue and we welcome your feedback on any aspect of the Journal.

Dr. Archana Mehrotra Director STM Journals

Journal of NanoScience, NanoEngineering & Applications

Contents

1. Series Resistor Method for Higher Signal-to-Noise Ratio and High Sensitivity in Superconducting Nanowire Single-Photon Detectors Venkata Naga Vamsi Annepu, Bhujanga Rao Annepu

2. Photo-Assisted Room Temperature Synthesis of Brightly Fluoresce ZnSe Quantum Dots in Aqueous Medium Girish Mohanta, Navraj Singh Brar, Rupesh Kumar, A. K. Paul, Akash Deep

3. Simple Hydrothermal Synthesis and Morphological Study of Magnetic Nanoparticles Md. Shariful Islam, Alam Khan, G.M. Shafiur Rahman, Hrithita Aftab, Yoshifumi Kusumoto

4. Synthesis by Solâ&#x20AC;&#x201C;Gel Method and Characterization of CaAlO: Mn, Dy Nanoparticles M. Freeda, G. Suresh

5. Storage Modulus and Glass Transition Temperature of MWNT/PMMA Polymer Nanocomposite Films with Different wt% of MWNT M. Verma, D. Patidar, M. Baboo, K. B. Sharma, N.S. Saxena

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print) Volume 4, Issue 2 www.stmjournals.com

Series Resistor Method for Higher Signal-to-Noise Ratio and High Sensitivity in Superconducting Nanowire Single-Photon Detectors Venkata Naga Vamsi Annepu1*, Bhujanga Rao Annepu2 1

Gitam Institute of Technology, Gitam University, Rushikonda, Visakhapatnam, India 2 College of Engineering, Andhra University, Visakhapatnam, India

Abstract A series resistor method has been presented for higher signal-to-noise and high sensitivity in superconducting nanowire single-photon detectors (SNSPD). This method has given a very high useful data yields exceeding 50% while still maintaining pure single-photon operation and wide dynamic range. The SNSPD signal is roughly proportional to the nanowire width, so narrow nanowire have poor signal-to-noise ratio (SNR) at widths from 4â&#x20AC;&#x201C;30 nm and fabrication at these length scales is extremely challenging. In this paper, the authors have addressed the SNR issues and demonstrated that the higher SNR and high sensitivity can be achieved at 30-nm-nanowire superconducting single-photon detector for different IB values.

Keywords: Single photon, Signal to noise ratio, Sensitivity, Detection efficiency, Dark count rate, Superconducting nanowire

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print) Volume 4, Issue 2 www.stmjournals.com

Photo-Assisted Room Temperature Synthesis of Brightly Fluoresce ZnSe Quantum Dots in Aqueous Medium Girish Mohanta1,2*, Navraj Singh Brar3, Rupesh Kumar3, A. K. Paul1,2, Akash Deep1,2 1

Academy of Scientific and Innovative Research, CSIR-CSIO, Chandigarh, India 2 Central Scientific Instruments Organisation (CSIR-CSIO), Chandigarh, India 3 DAV Institute of Engineering & Technology, Jalandhar, Punjab, India

Abstract The ZnSe quantum dots (QDs) have gained considerable research interest as an alternative to heavy-metal-based QDs and are non-toxic, have strong emission in UVblue region, and with wider band gap are suitable for doping various ions to tune their optical and electronics properties. For biological applications, aqueous stability of QDs is an indispensable prerequisite. Mercapto-carboxylic acids such as mercaptopropionic acids (MPA), thioglycolic acids (TGA), etc., are commonly used for providing aqueous stability to the QDs. They also provide surface functional groups suitable for bioconjugation as well as restrict size of QDs during synthesis. Photo-assisted synthesis of ZnSe QDs has been studied previously but requires refluxing of QDs at relatively high temperatures for longer durations. Here, the authors report a photo-assisted synthesis of ZnSe QDs capped with either MPA or TGA at room temperature in aqueous medium. The as-synthesized QDs were probed for their structural, optical and chemical properties through various characterization techniques. The synthesized QDs were ca 2â&#x20AC;&#x201C;3 nm in diameter; surface functionalized with carboxylic group and showed bright fluorescence in UV-blue region.

Keywords: ZnSe quantum dots, Fluorescence, Aqueous medium, Nanocrystals

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print) Volume 4, Issue 2 www.stmjournals.com

Simple Hydrothermal Synthesis and Morphological Study of Magnetic Nanoparticles Md. Shariful Islam1*, Alam Khan2, G.M. Shafiur Rahman3, Hrithita Aftab3, Yoshifumi Kusumoto4 1

Department of Animal Husbandry and Veterinary Science, Faculty of Agriculture, Rajshahi University, Rajshahi, Bangladesh 2 Department of Pharmacy, Rajshahi University, Rajshahi, Bangladesh 3 Department of Material Science and Engineering, Rajshahi University, Rajshahi, Bangladesh 4 International University of Kagoshima, Seiryo, Kagoshima, Japan

Abstract Magnetite (Fe3O4) nanoparticles were synthesized using FeCl3•6H2O or FeCl2•4H2O with 5 or 8 mmol concentration and 3 or 5 h incubation time with the constant pH (7.5) by simple hydrothermal decomposition and then transferred them into maghemite (γ-Fe2O3) and hematite (α-Fe2O3). Precisely, the objectives of the study were to evaluate the influences of salt type, its concentration and incubation time on the morphology of the assynthesized magnetic nanoparticles. Synthesized nanoparticles were characterized by means of XRD, FE-SEM, TEM, UV-Vis absorption (reflectance) spectra and magnetic hysteresis loops by superconducting quantum interference device (SQUID), without any size sorting. In case of iron hexahydrate (FeCl3•6H2O), 5 mmol salt concentration along with 5 h incubation period results in homogeneous spherical-shaped particles. On the other hand, the same salt but 8 mmol concentration and 3 h incubation period produced heterogeneous spherical-shaped particles with bigger particle sizes. In case of iron tetrahydrate (FeCl2•4H2O) almost neck-structured heterogeneous particles were obtained by using both types of salt concentrations and incubation period (5 or 8 mmol and 5 or 3 h). Finally, our study revealed that in both type of salts, increased concentration and decreased incubation period result in increased particles size.

Keywords: Magnetic materials, Spherical-shaped, Neck-structured, Hysteresis loops, Salt, Hyperthermia

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print) Volume 4, Issue 2 www.stmjournals.com

Synthesis by Solâ&#x20AC;&#x201C;Gel Method and Characterization of CaAlO: Mn, Dy Nanoparticles M. Freeda1*, G. Suresh2 1

Department of Physics, Ponjesly College of Engineering, Nagercoil, Tamil Nadu, India Department of Engineering Physics, FEAT, Annamalai University, Chidambaram, Tamil Nadu, India

Abstract Dy and Mn doped Calcium Aluminate nanoparticles were synthesized by using Sol-gel method. Heat treated material was characterized by X-ray diffraction(XRD), optical study of photoluminescence (PL) emission spectra, morphological study of scanning electron microscopy (SEM) combined with X-ray analysis. The Dy and Mn doped phosphor exhibits emission at the excitation of the material with 380 nm wavelength generates a strong emission at 480 nm. Besides this, subsidiary maxima at 417, 422 nm wavelength in violet region and 620 nm in red region.

Keywords: Dysporsium, XRD, SEM, Sol-gel method

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print) Volume 4, Issue 2 www.stmjournals.com

Storage Modulus and Glass Transition Temperature of MWNT/PMMA Polymer Nanocomposite Films with Different wt% of MWNT M. Verma*, D. Patidar, M. Baboo, K. B. Sharma, N.S. Saxena Semiconductor and Polymer Science Laboratory, Department of Physics, University of Rajasthan, Jaipur 302004, India Abstract This paper presents the study of behavior of storage modulus and glass transition temperature of MWNT/PMMA polymer nanocomposites prepared by solution casting method, with different (0, 0.1, 0.2, 0.3, 0.5, 1, 5, 10) wt% of MWNT in the PMMA matrix. Dynamic mechanical analysis has been done in tension mode. Storage modulus increases with CNT loading in matrix except for 0.1, 0.2 wt% CNT samples, for 0.5 wt% sample onwards to 10 wt% increases continuously, whereas glass transition temperature is found to increase smoothly for all samples, which is explained in terms of the interactions between polymer-MWNT and MWNT-MWNT.

Keywords: Nanocomposites, Storage modulus, Glass transition temperature, Dynamic mechanical analyzer