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Now showing items 1 - 16 of 34

  • Sol-Gel Synthesis of Zn Doped MgO Nanoparticles and Their Applications

    Sharma, Asha   Arya, Sandeep   Singh, Bikram   Prerna   Tomar, Amit   Singh, Suram   Sharma, Rakesh  

    The physicochemical properties of metal oxide nanoparticles can be significantly improved by doping. MgO and Zn2+ doped MgO (Zn:MgO) offers potential applications in photonic devices falling in the UV and visible region. In the present paper, sol gel method was employed to synthesize pure and Zn2+ doped MgO nanoparticles. XRD pattern inferred the crystalline nature of material and also the slight change in peak due to the dopant. FESEM showed the formation of nanoparticles with almost same shapes and dimensions with little agglomeration. Optical properties were studied by using UV-Vis and PL techniques. Doping of Zn2+ in MgO nanoparticles was verified by EDS.
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  • Design and fabrication of micro-channels based fluid viscosity sensor

    Arya, Sandeep   Sharma, Vandana   Shimi, S. L.  

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  • Review-Recent Advances in Carbon Nanomaterials as Electrochemical Biosensors

    Kour, Ravinder   Arya, Sandeep   Young, Sheng-Joue   Gupta, Vinay   Bandhoria, Pankaj   Khosla, Ajit  

    In the last three decades, a lot of scientific research has been carried out in the field of Carbon nanomaterials all over the world due to their significant electronic, optical, mechanical, chemical and thermal properties. The zero, one, two and three dimensional Carbon nanomaterials (i.e. fullerenes, Carbon nanotubes, Graphene, Carbon quantum dots, Carbon Nanohorns, Nanodiamonds, Carbon Nanofibres and Carbon black) have exhibited such inherent features that can be easily exploited in the development of advanced technology for sensing applications. The employment of nanomaterials within sensors has paved new way and opportunities for the detection of analytes or target molecules. Carbon nanomaterials based electrochemical biosensors have reported biocompatibility, better sensitivity, better selectivity and lower limits of detection to detect a wide range of chemical to biological molecules. In this paper, a comprehensive review has been made to cover recent developments in the field of Carbon based nanomaterials as electrochemical biosensors. The characteristic features of a variety of nanomaterials like fullerenes, Carbon nanotubes, Graphene, Carbon quantum dots, Carbon Nanohorns, Carbon Nanodiamonds, Carbon Nanofibres, Carbon black etc. have been discussed along with their synthesis methods. The recent application of all these nanomaterials as electrochemical biosensors for the detection of various biomolecules have been highlighted; the future prospects and possibilities in this field have been outlined. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
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  • Performance analysis of ZnO and HfO2 micro-pillars based capacitive antennas

    Arora, Rajat   Rana, Shashi B.   Arya, Sandeep  

    In this research paper, performance analysis of two different material-based micropillars capacitive antennas is proposed. The method involves formation of self-organized mask, micropillar formation by using process of etching and metal deposition (Au/Cr) on the top and bottom of micropillars. For fabrication of these capacitive antennas, we considered 2-inch p-type silicon (Si) wafers as a substrates material while upper and lower plates of capacitive antenna were fabricated by using gold as plating material on top and bottom. Both capacitive antennas were fabricated by taking the two different materials (ZnO and HfO2) micropillars which acts a dielectric material between two upper and lower gold plates. For realization of both antennas firstly we have simulated both the antenna using CST Microwave studio software and thereafter fabricated by using appropriate microfabrication technique. Both the metamaterial-based capacitive antennas were designed by taking dimension of 35 x 26 mm on the 2 Si substrate. The thickness (h) and dielectric constant (epsilon(r)) of silicon substrate were taken as 0.270 mm and 11.7, respectively. The proposed antenna was designed to operate at frequency range of 1-10 GHz, which signifies that return loss (S-11) parametermust be less than -10 dB and voltage standing wave ratio must be less than 2. To validate the design, various parameters of RF antenna such as the return loss, gain, surface current distribution, and radiation patterns were obtained and compared for the fabricated antennas. The simulated and experimental results were found to show good agreement.
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  • Analytic Model of Microcantilevers as Low Frequency Generator

    Arya, Sandeep   Khan, Saleem   Lehana, Parveen  

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  • Electrical properties of electrodeposited zinc selenide (ZnSe) nanowires

    Arya, Sandeep   Khan, Saleem   Lehana, Parveen   Gupta, Ishan   Kumar, Suresh  

    In this work, zinc selenide (ZnSe) nanowires were fabricated on indium-tin oxide coated glass substrate via template-assisted electrodeposition method from an electrolytic solution of zinc (II) sulphate (ZnSO4 center dot 7H(2)O) and selenium dioxide (SeO2). ZnSe nanowires of diameter 100 nm have been fabricated using polycarbonate track-etch membrane. Electrodeposition was done at 30 A degrees C temperature and the length of the nanowires was controlled by adjusting the deposition time. Both morphological and electrical characteristics were studied. Sample characterization was done using scanning electron microscope and X-ray diffraction. I-V measurements reveal that the ZnSe nanowires have non-linear behavior like Schottky diode characteristics. Further, the ZnSe nanowires were used in astable multivibrator which acts as capacitor to give conventional output behavior. The temperature dependent capacitive properties of ZnSe nanowires reveal that ZnSe nanowire can be used as temperature sensor.
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  • Template Based Electrochemical Synthesis of Copper (Cu) Nanowires as CH2Cl2 Sensor

    Gupta, Jyoti   Arya, Sandeep   Singh, Anoop   Verma, Sonali   Sharma, Asha   Singh, Bikram   Tomar, Amit  

    In this work, Copper (Cu) nanowires were synthesized electrochemically from aqueous acidic solution of 1M copper (II) sulfate (CuSO4 center dot 5H(2)O) on a copper substrate by template-assisted electrodeposition method. The electrodeposition was conducted at room temperature and the length of nanowires was controlled by adjusting the deposition time. Different Structural and morphological characteristics were examined using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and energy dispersive X-ray spectroscopy (EDX) that confirmed the successful synthesis of Cu nanowires. Moreover, the synthesized Cu nanowires were investigated for CH2Cl2 chemical sensing using different electrochemical techniques. The results showed that Cu nanowires can sense CH2Cl2 very effectively.
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  • Development of a Seed Analyzer using the Techniques of Computer Vision

    Arya, Sandeep  

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  • Morphological and Optical Characterization of Sol-Gel Synthesized Ni-Doped ZnO Nanoparticles

    Prerna   Arya, Sandeep   Sharma, Asha   Singh, Bikram   Tomar, Amit   Singh, Suram   Sharma, Rakesh  

    In this work, Ni-doped ZnO nanoparticles (NPs) were successfully synthesized by sol-gel method. The as-synthesized nanoparticles were characterized to investigate their morphology, structure, purity and optical properties. XRD analysis confirmed the formation of nanoparticles with average particle size of approx. 30 nm. SEM observations show the agglomeration of nanoparticles. The purity of the as-prepared NPs was confirmed by EDX analysis. The defect states were revealed from the photoluminescence (PL) spectra. The overall results obtained indicate that Ni-doped ZnO nanoparticles are promising candidate to fabricate nanoscale optoelectronic devices due to their wide band gap and excellent UV emission properties.
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  • Design and fabrication of MEMS based electrostatic cantilever as ultrasonic signal generator

    Arya, Sandeep   Khan, Saleem   Kumar, Suresh   Lehana, Parveen  

    This paper presents the design and fabrication of a 500 mu m x 200 mu m x 0.070 mu m micro-cantilever as ultrasonic frequency generator. Actuation energy (up to 4.1 V dc) after fixed intervals was necessary to produce stable oscillations. The device relies on the principle of electrostatic effect and the output in the form of low ultrasonic frequency signal is generated from the piezoelectric surface (ZnO) due to switching action. The dimensions of the proposed device are first optimized by modeling and the same design is then fabricated and characterized as high frequency signal generator. From the results, a huge difference between the simulated (22.67 kHz) and experimental (30.76 kHz) output signals has been found out. This may be caused due to a propagation delay and slow switching action in fabricated device. This work may be useful as an electrostatic micro-switch where low actuation dc voltage is needed to generate ultrasound signals. (c) 2016 Elsevier B.V. All rights reserved.
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  • Design and fabrication of electrostatic micro-cantilever array as audible frequency generator

    Arya, Sandeep   Khan, Saleem   Lehana, Parveen  

    Highlights • We designed and fabricated an array of four metallic micro-cantilevers on silicon substrate. • The working is based on electrostatic effect between the two electrodes. • An input signal is applied by two ways – (a) Asynchronous actuation and (b) Synchronous actuation. • Results showed a good agreement with the simulated model for input impulse applied synchronously. • For asynchronous actuation mode, the result of the as-fabricated device showed a variation. • The vibrations are generated periodically and the output is very much in the audible frequency range. Abstract In assistive technologies involving voice communication, an audio signal with specific shape is needed. In this regard, the design and fabrication of an electrostatic cantilever array is proposed. An array of four metallic micro-cantilevers with dimensions 650 μm × 200 μm × 0.3 μm is fabricated on the silicon substrate. The working principle is based on the electrostatic effect generated due to a conductive path applied between the electrodes. The results are taken from zinc oxide (ZnO) piezoelectric thin film that allows making contact with the vibrating cantilevers on a specified applied input impulse signals. The results demonstrated the switching action of the cantilevers that depends on the polarity of the input pulses. The results obtained are compared with the FEM based (COMSOL Multiphysics) model that is designed and analyzed prior to the experiment. Further, the experimental results showed a good agreement with the predicted values calculated by the simulated model for the input impulse signal applied synchronously to all the micro-cantilevers. However, for asynchronous actuation mode, the result of the as-fabricated device showed a variation than the simulated results. The vibrations are generated periodically from all the cantilevers and the output shows the resultant signals that are very much in the audible frequency range.
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  • Synthesis of Copper-Telluride (CuTe) Nanowires and its Characterization using He-Ne Laser

    Arya, Sandeep  

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  • Synthesis of Copper-Telluride (CuTe) Nanowires and its Characterization using He-Ne Laser

    Arya, Sandeep  

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  • Structural,optical,magnetic and antibacterial study of pure and cobalt doped ZnO nanoparticles

    Rana, Shashi B.   Singh, R. P. P.   Arya, Sandeep  

    In this research paper, pure and Co-doped ZnO nanoparticles were synthesized by using the wet precipitation method. The structural, morphological, optical and magnetic properties of the pure and Co doped ZnO nanoparticles were investigated. X-ray diffraction (XRD) spectra of Co doped ZnO NPs shows the shifting of characteristic XRD peak toward the higher angle which revealed that dopant Co is successfully incorporated into the lattice structure of ZnO nanoparticles. Structural morphology of pure and Co-doped ZnO nanoparticles samples was ascertained by using the scanning electron microscopy which confirms the formation of fine and clear spherical nanocrystallites with clear and distinctive boundaries. Energy-dispersive X-ray spectroscopy spectra show the elemental composition of Co2+ ions effectively in lattice site of Zn2+ ions. Photoluminescence and Raman spectra indicate the presence of oxygen vacancies and donor defects in the doped samples. UV-visible absorption spectroscopy showed the blue shifting of absorption edge as compared to pure ZnO nanoparticles sample. Pure and Co-doped ZnO nanoparticles revealed considerable changes in the M-H loop, particularly the diamagnetic behavior changed into ferromagnetic for Co-doped samples in vibrating sample magnetometer investigation. In this study, the antibacterial properties of the cobalt doped zinc oxide were further studied against three Gram-negative pathogens via using agar well diffusion technique. Co doped nanoparticles samples were then investigated as antibacterial agent to control the bacterial growth. It is further confirmed from our study that Co-doped ZnO NPs and their exposure to sunlight enhanced the antibacterial activity against three bacterial pathogens under study.
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  • 161

    Arya, Sandeep   Bauer, Paul   Han, Yong  

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  • Synthesis of Zinc Oxide Nanoparticles and Their Morphological,Optical,and Electrical Characterizations

    Arya, Sandeep   Lehana, Parveen K.   Rana, Shashi B.  

    In this work, zinc oxide (ZnO) nanoparticles were synthesized chemically by a sol gel method and their structural, morphological, and optical properties were characterized. The as-prepared ZnO nanoparticles were further transformed into the Cu/ZnO/Cr/Au heterostructure to investigate their electrical properties. The electrical characteristics of the heterostructure were determined at room temperature. The results showed that the obtained current-voltage (I-V) characteristics of Cu/ZnO/Cr/Au heterostructure resemble that of a photodiode with an ideality factor of 5.24. The forward resistance (under light of ae570 nm wavelength) is calculated as 330 K Omega, while under darkness, the forward resistance is estimated as 5 K Omega. The obtained results confirmed that the developed heterostructured device is a sterling solicitant for light harvesting applications.
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