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Baraneedharan, P., Shankari, D., Arulraj, A., Sephra, P. J., Mangalaraja, R. V., & Khalid, M. (2023). Nanoengineering of MXene-Based Field-Effect Transistor Gas Sensors: Advancements in Next-Generation Electronic Devices. J. Electrochem. Soc., 180(10), 107501.
Abstract: In recent years, Two-Dimensional (2D) materials have gained significant attention for their distinctive physical and chemical properties, positioning them as promising contenders for the next generation of electronic technologies. One notable group within these materials is MXenes, which have exhibited remarkable breakthroughs across various technological domains, including catalysis, renewable energy, electronics, sensors, fuel cells, and supercapacitors. By making subtle modifications to the surface termination, introducing metal ions, precise etching timing, and applying surface functionalization, the characteristics of MXenes can be fine-tuned to achieve desired band structures, rendering them suitable for sensor design. This review focuses on the strategic development of gas sensors based on Field-Effect Transistors (FETs), thoroughly examining the latest progress in MXene-based material design and addressing associated challenges and future prospects. The review aims to provide a comprehensive overview of MXene, summarizing its current applications and advancements in FET-based gas sensing.
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Kumaresan, N., Karuppasamy, P., Kumar, M. P., Peera, S. G., AlSalhi, M. S., Devanesan, S., et al. (2023). Synthesis and characterization of metal-free nanosheets of carbo-catalysts for bifunctional electrocatalyst towards HER and OER application. Mol. Catal., 539, 113043.
Abstract: Production of “green hydrogen” through water electrolysis is attracting considerable attention in recent years, due to the high demand for green energy technologies. The efficiency of water electrolysis depends on the electrocatalytic activity of anodic and cathodic electrocatalysts. Currently, utilizing Pt and RuO2-based elec-trocatalysts is expensive in terms of commercial aspects. Therefore, growing research for inventing efficient and cheap electrocatalysts is undergoing rigorously. In this work, we have synthesized, biomass-derived electro-catalysts with intrinsically implanted heteroatoms as hydrogen and oxygen evolution reactions in alkaline electrolytes. The biomass carbon catalyst is derived from the carbonation of the Acorus Calamus plant “root”. The derived carbon is activated by KOH treatment (C-750). The resultant carbon powder is characterized by various physiochemical and electrochemical characterization techniques. The C-750 catalyst is found to have excellent morphology, surface area (3488 m2/g), pore size (4.08 nm), pore volume (1.10 cc/g), and intrinsically doped N. The HRTEM analysis of C-750 reveals well-distributed microporous and graphitic surfaces. When used as an electrocatalyst for HER and OER analysis, the C-750 exhibited appreciable electrocatalytic activity with an overpotential of-0.330 V and 0.563 V vs. RHE, respectively at the current density of-10.0 mA/cm2. In addition, the C-750 catalyst also showed excellent stability with almost zero degradation in a chronoamperometric measurement carried out for 10 hrs.
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Shanmugaraj, K., Mangalaraja, R. V., Campos, C. H., Singh, D. P., Aepuru, R., Thirumurugan, A., et al. (2023). Gold nanoparticles decorated two-dimensional TiO2 nanosheets as effective catalyst for nitroarenes and rhodamine B dye reduction in batch and continuous flow methods. Inorg. Chem. Commun., 149, 110406.
Abstract: Our environment is greatly endangered by the accumulation of various toxic organic pollutants that are continually produced through unavoidable human needs and the industrialization process. Herein, we report highly active gold nanoparticles (AuNPs) immobilized on two-dimensional (2D) TiO2 nanosheets (AuNPs-TiO2NSs) as a catalyst for the catalytic reduction of nitroarenes (NAs) such as 4-nitroaniline (4-NA), 4-(4-nitrophenyl)morpholine (4-NM), 4-(2-fluoro-4-nitrophenyl)morpholine (4-FNM) and rhodamine B (RhB) dye in the presence of sodium borohydride (NaBH4) medium. Initially, TiO2NSs are prepared by the hydrothermal treatment followed by the modification with 3-aminopropyl-trimethoxysilane (APTMS) coupling agent for strong anchoring of the AuNPs. HR-TEM images exhibit that AuNPs (2.30 +/- 0.06 nm) are immobilized on the surface of ultrathin 2-dimensional TiO2NSs. AuNPs-TiO2NSs catalyst shows excellent catalytic activity towards the reduction of various NAs (4-NA, 4-NM and 4-FNM) and RhB dye with maximum conversion efficiency of >98 %. Moreover, the pseudo-first-order rate constants are estimated as 5.50 x 10- 3 s- 1, 7.20 x 10- 3 s- 1, 6.40 x 10-3 s- 1 and 4.30 x 10-3 s- 1 for the reduction of 4-NA, 4-NM, 4-FNM, and RhB, respectively. For large-scale in-dustrial applications, AuNPs-TiO2NSs catalyst embedded in a continuous flow-fixed bed reactor for the catalytic reduction of 4-NA and RhB dye under optimized reaction conditions. AuNPs-TiO2NSs catalyst shows high con-version rates for 4-NA (>99 %) and RhB (>99%) along with excellent recyclability over 12 cycles in continuous flow fixed bed reactor. The mechanism of synthetic pathway and catalytic reduction of NAs and RhB dye over AuNPs-TiO2NSs catalyst are also proposed. This study may lead to the use AuNPs-TiO2NSs catalyst with superior recyclable catalytic efficiency in various catalytic reactions.
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