Browsing by Author "Sasikumar, S."

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A comprehensive study on effect of annealing on structural, morphological and optical properties of CdO and photodetection of heterojunction n-CdO/p-Si diode
(Elsevier GmbH, 2021) Poul Raj, I.L.P.; Chidhambaram, N.; Saravanakumar, S.; Sasikumar, S.; Varadharajaperumal, S.; Alagarasan, D.; Alshahrani, T.; Shkir, M.; AlFaify, S.
The present investigation reports the synthesis of CdO using the facile sol-gel technique. The CdO samples exhibit cubic structure and their crystalline quality increases with different sintering temperatures (550, 650, and 750 °C). The maximum entropy method (MEM) was applied to calculate the charge density distribution of the CdO samples and the two-dimensional charge density maps showed a slight enlargement in the cell volume of the CdO with sintering temperatures. The bandgap of the CdO samples varied from 2.89 to 2.66 eV with increasing sintering temperature. Heterojunction n-CdO/p-Si photodiodes were constructed (using CdO samples) on silicon wafers using the spin coating procedure. The ideality factor of the diodes is found to decrease from 5.2 to 4.2 with sintering temperatures of the CdO. The heterojunction diode constructed using the CdO sample sintered at 750 °C exhibited the highest responsivity and external quantum efficiency values of 0.34 A/W and 109 %, respectively. Improved crystallinity, responsivity, and quantum efficiency make the developed CdO device useful for optoelectronics. © 2021 Elsevier GmbH
Nanomaterials-based Field Effect Transistor biosensor for cancer therapy
(Elsevier B.V., 2025) Sasikumar, S.; Sivaram, K.; Sreejisha, N.; Murugesan, S.
Biosensors made of nanomaterials play a prominent part in diagnostic applications in the biomedical domain. The peculiar characteristics of nanomaterials including quantum effects, self-assembly, and larger surface area make them an irresistible choice for biomedical applications. Cancer is one of the life-threatening diseases across the world and the second leading cause of death. Early diagnosing has its advantages, such as treating the cancer in the primary stage helps in the faster recovery of patients. Many enzymatic/protein assays and biosensors have been developed for early-stage cancer diagnosis. Despite many types of biosensors available for biosensing applications, Field Effect Transistor biosensors (FET) prove to be an excellent choice due to their minimalistic size, high versatility, low noise, and high reliability for detecting a life-threatening disease cancer. FETs made of nanomaterials can provide sensitive, specific, and precise detection of cancer biomarkers, assisting cancer diagnosis in its early stages. Certain significant factors like selectivity, anti-interference, sensitivity, reproducibility, reusability, disposability, economic viability, large-scale production, and operational conditions determine the efficiency of the FET biosensor in diagnosing cancers. Many works are being carried out to meet the above demands for FET-based biosensors. Various nanomaterials are employed to fabricate the FET, and their performances are so incredible. This review provides insight into various nanotechnology-based FET biosensors such as Graphene Carbon Dots-based FET, Carbon nanotubes (CNT)-based FET, Silicon nanowire-based FET, Polycrystalline Si nanowire-based FET, Graphene Oxide-based FET, Indium Selenide (InSe)-based FET, Molybdenum disulfide (MoS2)-based FET, Zinc oxide (ZnO)-based FET, Tungsten diselenide (WSe2)-based FET, MXene-based FET, and nanocomposites-based FET. Subsequently, their applications in early cancer diagnosis are also comprehensively discussed including their various fabrication approaches for binding different bioreceptors such as enzymes, cells, aptamers, deoxyribonucleic acid (DNA) and antibodies followed by targeting the specific analyte of cancer cells. © 2025 The Authors
Review on the development of natural rubber/nanoclay nanocomposites
(Elsevier, 2024) Sasikumar, S.; Kishore Sivaram, S.; Yadav, P.K.; Murugesan, S.
Nanoclays are aluminosilicate layers separated by nanometers; they possess some outstanding properties, including barrier properties, flame resistance, superhydrophobicity, hydrolytic stability, hydrolysis resistance, biocompatibility, stiffness, stimuli responsivity, dynamic mechanical qualities along with low-temperature flexibility, and resilience. Surface-modified nanoclays provide excellent adhesion to the polymer matrix. They also have higher free energy for the surface and a higher degree of exfoliation or intercalation morphology. These unique properties possessed by nanoclays have piqued the interest of both industry and research groups, even in the 20th century. The natural rubber/nanoclay architecture has potential applications in the field of engineering materials. This article discusses the latest advancements in natural rubber/nanoclay composite systems for engineering applications. © 2024 Elsevier Inc. All rights reserved.