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Nickel Decorated Single-Wall Carbon Nanotube as CO Sensor

Soft Nanoscience Letters 2013年第4期3卷 9-11页

作者： ngangbam bedamani singh Barnali Bhattacharya Utpal Sarkar Department of Physics Assam University Silchar Assam.

Based on spin-polarized density functional theory (DFT) calculations, the interaction between nickel cluster decorated single-wall carbon nanotube (CNT) and CO molecule has been investigated. DFT calculations are performed with generalized gradient approximation (GGA) using Perdew-Burke-Ernzerhof (PBE) functional. Interaction of CNT and cluster induces spin polarization in the CNT. Nickel decorated CNT has a large magnetic moment of 4.00 μB which decreases to 0.10 μB when CO molecule is absorbed to it. Such a drastic reduction in magnetization may be detected by SQUID magnetometer. Hence by measuring magnetization change, CNT-cluster system may be used as gas detectors. The charge transfer between the systems has been discussed through Mulliken charge analysis for different orientations of the adsorbed CO molecule. We observed that CNT-cluster system acts as electron donor and CO molecule acts as electron acceptor in this study.

关键词： Nickel Cluster Carbon Nanotube CO Sensor DFT Magnetic Moment

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Interaction of Boron-Nitrogen Substitued Graphene Nanoribbon with Nucleobases: The Idea of Biosensor

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Soft Nanoscience Letters 2013年第4期3卷 43-45页

作者： Barnali Bhattacharya ngangbam bedamani singh Utpal Sarkar Department of Physics Assam University Silchar India.

In this paper we have designed a biosensor device built from B-N substituted graphene nanoribbon within density functional based tight-binding (DFTB) framework. We have investigated the interaction of the nucleobases adenine (A), Guanine (G), Cytosine (C) and Thymine (T) with device. Our calculation suggests that all the nucleobases have different interaction strength when they interact with device and shows that guanine has stronger interaction with device than other nucleobases. It reveals that the absorption energy shows the hierarchy: G > C > T > A. Our results also demonstrate the transport properties of the device and how the transport properties change due to the absorption of nucleobases on the device.

关键词： Biosensor DFTB Nucleobases Transport Properties Nanoribbon

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On the Urbach's formula for evaluation of electron trapping parameter:The case of persistent luminescent materials

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Journal of Rare Earths 2017年第8期35卷 733-738页

作者： ngangbam Chandrasekhar K.Bishal singh R.K.Gartia Department of Physics Manipur University Imphal-795003 Manipur India

Urbach’s formula for evaluation of electron trapping parameter that happens to be the earliest has emerged as a popular method amongst researchers of persistent luminescence. In this study, we analysed the thermoluminescence curves of glow-in-the-dark phosphors. Those included some curves recorded by us and others that solely used the Urbach’s formula. Using the parameter obtained by rigorous analysis by fitting the whole TL curves, we presented a comprehensive picture of the potentialities and limitations of the simple Urbach’s relation E=T_m/500, where E is the trap-depth and T_m the peak temperature in absolute scale, first proposed by Urbach in 1930. Some simple thumb rules on the use of the formula were presented for beginners as well as non-specialists so that entry of physically unrealistic data into the literature was prevented.

关键词： Urbach’s formula electron-trapping parameter glow-in-the-dark phosphor afterglow rare earths

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Vaidya Solution in Non-Stationary de Sitter Background: Hawking’s Temperature

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International Journal of Astronomy and Astrophysics 2013年第4期3卷 494-499页

作者： ngangbam Ishwarchandra Kangujam Yugindro singh Department of Physics Manipur University Imphal India

In this paper we propose a class of non-stationary solutions of Einstein’s field equations describing an embedded Vaidya-de Sitter solution with a cosmological variable function Λ(u). Vaidya-de Sitter solution is interpreted as the radiating Vaidya black hole which is embedded into the non-stationary de Sitter space with variable Λ(u). The energymomentum tensor of the Vaidya-de Sitter black hole may be expressed as the sum of the energy-momentum tensor of the Vaidya null fluid and that of the non-stationary de Sitter field, and satisfies the energy conservation law. We also find that the equation of state parameter w= p/ρ = -1 of the non-stationary de Sitter solution holds true in the embedded Vaidya-de Sitter solution. It is also found that the space-time geometry of non-stationary Vaidya-de Sitter solution with variable Λ(u) is type D in the Petrov classification of space-times. The surface gravity, temperature and entropy of the space-time on the cosmological black hole horizon are discussed.

关键词： Vaidya Solution Non-Stationary de Sitter Einstein’s Equations Energy-Momentum Tensor

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