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- 저자 : Bhaskar Reddy, M. (검색결과 17 건)
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Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
Reddy, B.V. Subba,Reddy, P. Sivaramakrishna,Reddy, Y. Jayasudhan,Bhaskar, N.,Reddy, B. Chandra Obula Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
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Current–voltage–temperature (I–V–T) characteristics of Pd/Au Schottky contacts on n-InP (111)
M. Bhaskar Reddy,A. Ashok Kumar,V. Janardhanam,V. Rajagopal Reddy,P. Narasimha Reddy 한국물리학회 2009 Current Applied Physics Vol.9 No.5
We have investigated the current–voltage–temperature (I–V–T) characteristics of Pd/Au/InP Schottky barrier diodes in the temperature range of 220–400 K. The I–V analysis based on thermionic emission (TE) theory shows an abnormal decrease of apparent barrier height and increase of ideality factor at low temperatures. The conventional Richardson plot exhibits nonlinearity with activation energy of 0.17 eV and the Richardson constant value of 5.63 × 10-6 A cm-2 K-2. The nonlinearity in the Richardson plot and strong dependence of Schottky barrier parameters on temperature may be attributed to the spatial inhomogeneity in the interface. Further, the homogeneous barrier height has been obtained from the linear relationship between experimentally obtained effective barrier heights and ideality factors. Φb versus (2kT)-1 plot has been drawn to obtain the mean barrier height [Φbo(T = 0 K)] and the standard deviation (σs) at zero-bias which are found to be 0.84 eV, 138 meV, respectively. The series resistance is also estimated from the forward current–voltage characteristics of Pd/Au/InP Schottky contacts using Cheung’s method and found that it is strongly dependent on temperature and also decreases with increase in temperature. We have investigated the current–voltage–temperature (I–V–T) characteristics of Pd/Au/InP Schottky barrier diodes in the temperature range of 220–400 K. The I–V analysis based on thermionic emission (TE) theory shows an abnormal decrease of apparent barrier height and increase of ideality factor at low temperatures. The conventional Richardson plot exhibits nonlinearity with activation energy of 0.17 eV and the Richardson constant value of 5.63 × 10-6 A cm-2 K-2. The nonlinearity in the Richardson plot and strong dependence of Schottky barrier parameters on temperature may be attributed to the spatial inhomogeneity in the interface. Further, the homogeneous barrier height has been obtained from the linear relationship between experimentally obtained effective barrier heights and ideality factors. Φb versus (2kT)-1 plot has been drawn to obtain the mean barrier height [Φbo(T = 0 K)] and the standard deviation (σs) at zero-bias which are found to be 0.84 eV, 138 meV, respectively. The series resistance is also estimated from the forward current–voltage characteristics of Pd/Au/InP Schottky contacts using Cheung’s method and found that it is strongly dependent on temperature and also decreases with increase in temperature.
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Dudem, Bhaskar,Mule, Anki Reddy,Patnam, Harishkumar Reddy,Yu, Jae Su Elsevier 2019 Nano energy Vol.55 No.-
<P><B>Abstract</B></P> <P>Recently, wearable and flexible triboelectric nanogenerators (TENGs) have attracted tremendous research interest owing to their ability to harvest the energy from working environments and been further utilized to power various portable electronics. In this regard, for the first time, we report a polyaniline (PANI)-based flexible and wearable TENG in low-processing cost with superior electrical performance and durability. The cotton textile with good flexibility and intertwined micro-fibrous network is utilized as a scaffold to deposit PANI by a facile, cost-effective and low-temperature in-situ polymerization method. Moreover, the fibrous textured cotton textile can also offer high surface roughness, which enhances the output performance of TENG. Herein, this PANI coated worn-out cotton textile (PANI@WCT) is employed as a positive triboelectric material and electrode to design a TENG. The PANI@WCT produced at the deposition time of 20 h is realized as an optimal sample to attain high output performance. The electrical stability and mechanical durability of PANI@WCT-based TENG (PW-TENG) are also examined under long-term cyclic compression operations and various mechanical deformation cycles. Furthermore, the PANI@WCT has a potency in constructing vertical contact-separation dual-electrode mode TENG as well as it also serves as a single-electrode mode. So, the electrical output performance of single-electrode mode PW-TENG is also analyzed while it makes a contact with various materials available in our daily life. Finally, to demonstrate the practical applications of PW-TENG, the generated power is used to drive various portable electronics for wearable electronic applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We reported a polyaniline-based flexible and wearable TENG in low-processing cost with superior performance. </LI> <LI> It exhibited a stable electrical performance even after long-term compression and mechanical deformation operations. </LI> <LI> PANI@WCT has a potency in constructing the dual-electrode mode as well as a single-electrode mode TENG. </LI> <LI> Finally, the PW-TENG was employed to drive various portable electronics for wearable electronic applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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M. Bhaskar Reddy,V. Janardhanam,A. Ashok Kumar,V. Rajagopal Reddy,P. Narasimha Reddy 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The effect of rapid thermal annealing on the electrical and structural properties of Ni/Au Schottky contacts on n-InP have been investigated by current–voltage (I–V), capacitance–voltage (C–V), auger electron spectroscopy (AES) and X-ray diffraction (XRD) techniques. The Au/Ni/n-InP Schottky contacts are rapid thermally annealed in the temperature range of 200–500 ℃ for a duration of 1 min. The Schottky barrier height of as-deposited Ni/Au Schottky contact has been found to be 0.50 eV (I–V) and 0.86 eV (C–V),respectively. It has been found that the Schottky barrier height decreased with increasing annealing temperature as compared to as-deposited sample. The barrier height values obtained are 0.43 eV (I–V),0.72 eV (C–V) for the samples annealed at 200 ℃, 0.45 eV (I–V) and 0.73 eV (C–V) for those at 400 ℃. Further increase in annealing temperature to 500 ℃ the barrier height slightly increased to 0.46 eV (I–V) and 0.78 eV (C–V) compared to the values obtained for the samples annealed at 200 ℃ and 400 ℃. AES and XRD studies showed the formation of indium phases at the Ni/Au and InP interface and may be the reason for the increase in barrier height. The AFM results showed that there is no significant degradation in the surface morphology (rms roughness of 1.56 nm) of the contact even after annealing at 500 ℃.
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Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
B. V. Subba Reddy,P. Sivaramakrishna Reddy,Y. Jayasudhan Reddy,N. Bhaskar,B. Chandra Obula Reddy 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
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Bhaskar P. Sai,Reddy B. Dinesh 차세대컨버전스정보서비스학회 2022 Journal of Digital Media & Culture Technology Vol.2 No.1
Amidst the rapid technological advancements, big data has emerged as a crucial component in healthcare transformation, influencing clinical operations, pharmaceutical R&D and personalized treatments. The Chinese government has proactively responded to this trend by promoting and standardizing big data applications in healthcare. In this regard, the purpose of this study is to explore the evolution and implications of big data in healthcare with a specific focus on the medical data management in China. For this, this study uses a survey-based approach and proposing a risk assessment index system to underline the significance of big data and cloud resources. Findings indicates that areas such as data analysis, diagnosis processes and lack of protection are the most at risk. Sidelegislation, healthcare providers, insurers and other entities handling medical data need to be educated on the importance of data privacy and the procedures to maintain it.
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Dudem, Bhaskar,Bharat, L. Krishna,Patnam, Harishkumarreddy,Mule, Anki Reddy,Yu, Jae Su The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.33
<P>Enhancing the output performance of nanogenerators using composite films consisting of a piezoelectric material embedded into polymers has gained much attention over the last few years. Such composite films can provide a high surface charge density and dielectric permittivity, which can further efficiently enhance the performance of nanogenerators. We, for the first time, employed aluminum (Al)-doped barium titanate (BaTiO3; ABTO) particles to enhance the performance of nanogenerators. These ABTO particles were synthesized <I>via</I> a solid-state technique, and the effect of Al dopant concentration on their crystallinity and ferroelectric properties was systematically investigated. However, the BTO particles with 2% Al dopant concentration exhibited a high remnant polarization and piezoelectric coefficient, and they were further employed to efficiently enhance the output performance of the hybrid piezo/triboelectric nanogenerators. For this, these ABTO particles were first mixed with polydimethylsiloxane (PDMS) to prepare a composite film. Next, the ABTO/PDMS composite film was employed as a piezoelectric material and triboelectric material of the hybrid nanogenerator (HNG) and exhibited a high output performance owing to their synergetic effects. In addition, the influence of the surface roughness of the composite film on the performance of the HNG was also investigated and optimized. Consequently, the HNG device with the rough surface ABTO/PDMS composite film exhibited maximal open-circuit voltage, short-circuit current, and power density values of ∼945 V, ∼59.8 μA, and ∼42.4 W m<SUP>−2</SUP>, respectively. For practical device application, the stable and high electrical power generated from the HNG device was employed to light several light-emitting diodes and power portable electronic devices.</P>
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Dudem, Bhaskar,Kim, Dong Hyun,Mule, Anki Reddy,Yu, Jae Su American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.28
<P>Triboelectric nanogenerator (TENG) technology is an emerging field to harvest various kinds of mechanical energies available in our living environment. Nowadays, for industrial and large-scale area applications, developing the TENG with low device processing cost and high electrical output is a major issue to be resolved. Herein, we designed a TENG with low cost by employing the microgrooved architectured (MGA)-poly(tetrafluoroethylene) (PTFE; Teflon) and aluminum as triboelectric materials with opposite tendencies. Moreover, the MGA-PTFE was fabricated by a single-step, facile, and cost-effective thermal imprinting lithography technique via micropyramidal textured silicon as a master mold, fabricated by a wet-chemical etching method. Therefore, designing the TENG device by following these techniques can definitely reduce its manufacturing cost. Additionally, the electrical output of TENG was enhanced by adjusting the imprinting parameters of MGA-PTFE. Consequently, the MGA-PTFE was optimized at an imprinting pressure and temperature of 5 MPa and 280 °C, respectively. Thus, the TENG with an optimal MGA-PTFE polymer exhibited the highest electrical output. A robustness test of TENG was also performed, and its output power was used to drive light-emitting diodes and portable electronic devices. Finally, the real application of TENG was also examined by employing it as a smart floor and object-falling detector.</P> [FIG OMISSION]</BR>
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