Journal of Nanoscience,

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May - August 2014

(JoNSNEA)ISSN: 2321-5194

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Journal of NanoScience, NanoEngineering & Applications

Journal of NanoScience, NanoEngineering & Applications

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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.

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eminent Scientists and Engineers in every field. JoNSNEA provides an outlet for Research findings

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The aim and scope of the Journal is to provide an academic medium and an important reference for

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STM JOURNALS

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 1

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 5

3. Simple Hydrothermal Synthesis and Morphological Study of Magnetic NanoparticlesMd. Shariful Islam, Alam Khan, G.M. Shafiur Rahman, Hrithita Aftab, Yoshifumi Kusumoto 14

4. Synthesis by Sol–Gel Method and Characterization of CaAlO: Mn, Dy NanoparticlesM. Freeda, G. Suresh 23

5. Storage Modulus and Glass Transition Temperature of MWNT/PMMA Polymer Nanocomposite Films with Different wt% of MWNTM. Verma, D. Patidar, M. Baboo, K. B. Sharma, N.S. Saxena 28

ContentsJournal of NanoScience, NanoEngineering & Applications

JoNSNEA (2014)© STM Journals 2014. All Rights Reserved

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 Annepu

2

1Gitam Institute of Technology, Gitam University, Rushikonda, Visakhapatnam, India

2College 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 4–30 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

JoNSNEA (2014)© STM Journals 2014. All Rights Reserved

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 Brar

3, Rupesh Kumar

3, A. K. Paul

1,2, Akash Deep

1,2

1Academy of Scientific and Innovative Research, CSIR-CSIO, Chandigarh, India

2Central Scientific Instruments Organisation (CSIR-CSIO), Chandigarh, India

3DAV 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 UV-

blue 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 2–3 nm in diameter; surface functionalized with carboxylic group and showed bright fluorescence in

UV-blue region.

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

JoNSNEA (2014)© STM Journals 2014. All Rights Reserved

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 Khan

2, G.M. Shafiur Rahman

3, Hrithita Aftab

3,

Yoshifumi Kusumoto4

1Department of Animal Husbandry and Veterinary Science, Faculty of Agriculture, Rajshahi

University, Rajshahi, Bangladesh 2Department of Pharmacy, Rajshahi

University, Rajshahi, Bangladesh

3Department of Material Science and Engineering, Rajshahi

University, Rajshahi, Bangladesh

4International 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 as-synthesized 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

JoNSNEA (2014)© STM Journals 2014. All Rights Reserved

Journal of NanoScience, NanoEngineering & Applications ISSN: 2231-1777 (online), ISSN: 2321-5194 (print)

Volume 4, Issue 2

www.stmjournals.com

Synthesis by Sol–Gel Method and Characterization of

CaAlO: Mn, Dy Nanoparticles

M. Freeda1*, G. Suresh

2

1Department of Physics, Ponjesly College of Engineering, Nagercoil, Tamil Nadu, India

2Department 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

JoNSNEA (2014)© STM Journals 2014. All Rights Reserved

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