Gandham Lakshminarayana
@knu.ac.kr
Intelligent Construction Automation Center
Kyungpook National University
RESEARCH INTERESTS
RE-doped glasses; Thin films; Fuel Cells; Nanomaterials; Inorganic Scintillators
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Cheng Wu, Peiwen Lv, Zhaojie Zhu, Jianfu Li, Chaoyang Tu, Chenlong Chen, G. Lakshminarayana, Hongyan Wang, and Yan Wang
Elsevier BV
A.M. El-naggar, Nourah Alhaqbani, Mohamed Bakr Mohamed, A.M. Kamal, A.A. Albassam, and G. Lakshminarayana
Elsevier BV
A.M. El-naggar, Lamya A. Alsulaymani, Mohamed Bakr Mohamed, A.M. Kamal, A.A. Albassam, and G. Lakshminarayana
Elsevier BV
Mohamed Bakr Mohamed, Zein K. Heiba, A. M. El-naggar, A. M. Kamal, and G. Lakshminarayana
The Electrochemical Society
An analysis was conducted on the optical, structural, and dielectric characteristics of PVA/CMC/(1−x)ZnWO4/xPbS blends. The structures of the filler samples, undoped, and doped blends were examined using X-ray diffraction. The crystallite sizes of the various phases in the filler samples are affected by the amount of PbS in the nanocomposite. The morphologies of different blends were explored using scanning electron microscopy. The doped blend exhibited superior absorption of Ultraviolet A (UVA) and Ultraviolet B (UVB) types in addition to the visible spectrum. The optical band gaps were minimized to (5.37, 5.56, 4.11) and (4.76, 3.14, 2.92) eV for direct and indirect optical transitions, respectively, when the PVP/CMC doped with nanocomposite had 10% PbS. The highest refractive index, optical dielectric constant,and nonlinear optical parameter values were achieved when the blend was loaded with ZnWO4 only while the highest optical conductivity was obtained as the blend contained 15% PbS. The highest fluorescence intensity was observed when the fillers did not contain PbS, and it decreased as the concentration of PbS in the filler increased.
A.M. El-naggar, Nourah Alhaqbani, A.M. Kamal, A.A. Albassam, G. Lakshminarayana, and Mohamed Bakr Mohamed
Elsevier BV
A.M. El-Naggar, Mohamed Bakr Mohamed, A.M. Kamal, G. Lakshminarayana, and Zein K. Heiba
Elsevier BV
A.M. El-naggar, Lamya A. Alsulaymani, Mohamed Bakr Mohamed, Ahmad A. Alsaleh, A.M. Kamal, A.A. Albassam, A.M. Aldhafiri, and G. Lakshminarayana
Elsevier BV
A.M. El-naggar, Lamya A. Alsulaymani, A.M. Kamal, A.A. Albassam, G. Lakshminarayana, and Mohamed Bakr Mohamed
Elsevier BV
Mohamed Bakr Mohamed, Zein K. Heiba, A.M. El-naggar, A.M. Kamal, and G. Lakshminarayana
Elsevier BV
A.M. El-naggar, Zein K. Heiba, A.M. Kamal, G. Lakshminarayana, and Mohamed Bakr Mohamed
Elsevier BV
Xuxing Le, Longxing Zheng, Yan Wang, Zhaojie Zhu, Jianfu Li, Hongyan Wang, G. Lakshminarayana, and Chaoyang Tu
Springer Science and Business Media LLC
G. Lakshminarayana, Yan Wang, and Jonghun Yoon
Elsevier BV
Zein K. Heiba, A.M. El-naggar, A.M. Kamal, A.M. Aldhafiri, G. Lakshminarayana, and Mohamed Bakr Mohamed
Elsevier BV
Najeh Rekik, Ibrahim Isah, Norah A.M. Alsaif, Muath Alkadi, Shehu Aminu Yamusa, Ibtihal M. Alsalamah, Amiruddin Shaari, G. Lakshminarayana, Saed Salman, Razif Razali,et al.
Elsevier BV
Zein K. Heiba, M.M. Ghannam, Mohamed Bakr Mohamed, M. M.S. Sanad, Mohamed H. Abdel-Kader, A.M. El-naggar, and G. Lakshminarayana
Elsevier BV
Zein K. Heiba, A. M. El-naggar, A. M. Kamal, G. Lakshminarayana, and Mohamed Bakr Mohamed
The Electrochemical Society
This study is devoted to optimizing the optical and dielectric parameters of polyvinyl alcohol (PVA)/ carboxymethyl cellulose (CMC)/ polyvinylpyrrolidone (PVP) blended polymer by adding ZnMn2O4/CuCo2O4 nanocomposite and controlling the amounts of multi-walled carbon nanotubes (MWCNTs) to engage them in flexible optoelectronics and storage energy capacitors. Herein, 0.9ZnMn2O4/0.1CuCo2O4 was synthesized by co-precipitation and hydrothermal methods and loaded with different ratios of MWCNTs into PVA/CMC/PVP blend to produce films by solution casting procedure. The crystallite size of 0.9ZnMn2O4/0.1CuCo2O4 was determined using transmission electron microscopy. The structures of the filler and doped blends were explored via the X-ray diffraction technique. The optical features of undoped and doped blends were explored by diffused reflectance and fluorescence spectrophotometers. The addition of ZnMn2O4/CuCo2O4 to PVA/CMC/PVP caused a decline of direct and indirect optical band gaps from 5.33 and 5.03 eV to 5.19 and 4.66 eV, respectively. By adding different amounts of MWCNTs, the direct/indirect optical band gap reduced irregularly, and they attained their minimum values (5.07, 4.46) eV as it doped with 0.6 Wt% MWCNTs. The highest values of refractive index, extinction coefficient, optical conductivity and nonlinear optical parameters were achieved in the blend containing ZnMn2O4/CuCo2O4/0.6 Wt% MWCNTs. It is also found that the dielectric constant and ac conductivity rose with the insertion of ZnMn2O4/CuCo2O4/0.6 Wt% MWCNTs. The highest energy density value was found in the polymer blend of PVA/CMC/PVP/ZnMn2O4/CuCo2O4/0.8 Wt% MWCNTs blended polymer. Electrical modulus and Nyquist plots for different blends were also examined. The results recommend the doped blends as a good candidate for optoelectronics and energy storage capacitor applications.
Xuhong Li, Jiaxue Yang, Zhaojie Zhu, Jianfu Li, Chaoyang Tu, G. Lakshminarayana, and Yan Wang
Elsevier BV
Zein K. Heiba, A. M. Kamal, A. M. El-naggar, G. Lakshminarayana, and Mohamed Bakr Mohamed
Informa UK Limited
Zein K. Heiba, A. M. El-Naggar, A. M. Kamal, G. Lakshminarayana, and Mohamed Bakr Mohamed
Informa UK Limited
Zein K. Heiba, A.M. El-naggar, A.M. Kamal, G. Lakshminarayana, and Mohamed Bakr Mohamed
Informa UK Limited
Mengge Dong, Suying Zhou, Xiangxin Xue, He Yang, M.I. Sayyed, Daria Tishkevich, Alex Trukhanov, and G. Lakshminarayana
Elsevier BV
G. Lakshminarayana, A.N. Meza-Rocha, O. Soriano-Romero, U. Caldiño, A. Lira, and Jonghun Yoon
Elsevier BV
Haidong WANG, Yan WANG, Zhaojie ZHU, Jianfu LI, Gandham LAKSHMINARAYANA, and Chaoyang TU
Shanghai Institute of Ceramics
G. Lakshminarayana, A.N. Meza-Rocha, O. Soriano-Romero, U. Caldiño, A. Lira, and Jonghun Yoon
Elsevier BV
Yaqian Zou, Yan Wang, Zhaojie Zhu, Jianfu Li, G. Lakshminarayana, and Chaoyang Tu
Elsevier BV