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Design and Analysis of Transition Metal Dichalcogenide-Based Feedback Transistor
Published in Ashish Raman, Deep Shekhar, Naveen Kumar, Sub-Micron Semiconductor Devices, 2022
Prateek Kumar, Maneesha Gupta, Kunwar Singh, Ashok Kumar Gupta, Naveen Kumar
TMDC materials are found in the form MX2, where M represents transition metals like molybdenum, tungsten, and so forth, and X denotes chalcogens like sulfur, selenium, etc. Most common TMDC materials are molybdenum disulfide (MoS2), tungsten disulfide (WS2), molybdenum ditelluride (MoTe2), molybdenum diselenide (MoSe2), and tungsten diselenide (WSe2). TMDCs are extremely promising for nanoscale devices as a single layer of TMDC materials is only 6.5 Å thick. In TMDC materials, each atom is bound to each other by the van der Waals force. TMDC materials can be fabricated using different techniques, the most common of which are exfoliation, chemical vapor deposition, and molecular beam epitaxy. These materials have a direct bandgap in a few-layered configuration, which make them suitable even for optoelectronic applications. In the work “2D Transition Metal Dichalcogenides,” Manzeli et al. thoroughly reviewed TMDC materials and put the limelight on spin orbiting and the behavior of material under high-frequency applications [25]. Although there are transistors designed using TMDC materials, most of them suffer from a poor ION/IOFF ratio because of poor mobility of charge carriers of TMDC materials.
Modern Applications and Current Status of Liquid and Crystal Nanomaterials in Environmental Industry
Published in Uma Shanker, Manviri Rani, Liquid and Crystal Nanomaterials for Water Pollutants Remediation, 2022
Rachna, Uma Shanker, Manviri Rani
Nanomaterials were able to introduce the structure of functionalized materials having size, shape, surface, morphology and optical properties as desired by the method (Kaushik et al. 2014a, b, 2016a, b, 2017, 2018, Tiwari et al. 2019). The small size of LCN can easily merge and align into the liquid crystalline surface to form a new phase of the material. This new class of sensing can exhibit unusual features, which were absent in the conventional sensors. The enhanced order parameters of LCN can help in easy binding to its surface (Choudhary et al. 2018). These properties can again benefit in compatibility, sensing sensibility and selectivity in the overall process of sensors (Vallamkondu et al. 2018). The generally used materials in LCN are carbon nanostructures, tungsten diselenide and molybdenum diselenide owing to their strong pi-stacking interactions (Kim et al. 2011). The LCN is highly dependent on surface effects. Hence, even a small change on the surface can result in the orientation of molecules in different directions. Interaction of light intensity with LCN surface causes a change in the light intensity (Liao et al. 2012). Some of the LCN based biosensors are listed in Table 2.
Black Phosphorus
Published in Sanjeev Kumar Raghuwanshi, Santosh Kumar, Yadvendra Singh, 2D Materials for Surface Plasmon Resonance-based Sensors, 2021
Sanjeev Kumar Raghuwanshi, Santosh Kumar, Yadvendra Singh
Srivastava and Jha numerically validate SPR biosensors for gas-sensing applications (Srivastava and Jha 2018). The proposed sensor has BP and few layers of 2D material such as graphene and molybdenum diselenide (MoSe2). Here, BK7 is the coupling prism and silver (Ag) is used as the SPR active material. The sensitivity of 110° RIU−1 is achieved using this sensor. The proposed sensor is suitable for the detection of harmful volatile organic composites and dangerous gases. Maurya, Prajapati, Raikwar, and Saini (2018) demonstrated a multilayer SPR biosensor using silicon and BP, that is able to detect nitrogen dioxide (NO2) gas. NO2 gas has a high fitment property with the surface of the BP; hence, the proposed gas sensor is susceptible to the NO2 gas detection. Pal, Verma, Saini, and Prajapati (2019) suggested a modified multiplayer configuration of an SPR biosensor using BP, WS2, WSe2 TMDC nanomaterial, silicon, and Au metal.
Surface morphology engineering of metal oxide-transition metal dichalcogenide heterojunction
Published in Journal of Asian Ceramic Societies, 2022
Chang-Hwan Oh, Roshni Satheesh Babu, Seung-Il Kim, Dong-Park Lee, Gyuhyeon Sim, Do-Hyeon Lee, Yeonjin Je, Kim Chan Hwi, Woo Jin Jeong, Gyeong Hee Ryu, Jun Young Kim, Sang Yong Nam, Jae Hyun Lee, Jun Hong Park
Two-dimensional (2D) transition metal dichalcogenides (TMD) are well-studied layered materials with unique physical properties, widely used in next-generation electronic and optoelectronic devices such as chemical sensors [1,2], memory devices [3,4], batteries [5,6], phototransistors [7], and photodetectors [8]. Molybdenum diselenide (MoSe2) is an excellent choice for low-power electronic applications and exhibits relatively low internal resistance and high electron and hole mobilities of about 200 and 150 cm2V−1s−1 [9], respectively, enabling it to be a promising material for field-effect transistors (FETs). Furthermore, the vertical MoSe2-MoOx heterojunctions exhibit current rectifying characteristics and better photoresponse performance and have wide applications in electronic and optoelectronic devices [10].