Journal ArticleDOI
Ultrasensitive Detection of Mercury Ions Under UV Illumination of MoS 2 Functionalized AlGaN/GaN Transistor
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In this article, the MoS2 functionalized AlGaN/GaN high-electron mobility transistor (HEMT) was utilized for the first time to detect toxic mercury (Hg2+) ions under ultraviolet (UV) illumination.Abstract:
In this work, the MoS2 functionalized AlGaN/GaN high-electron mobility transistor (HEMT) was utilized for the first time to detect toxic mercury (Hg2+) ions under ultraviolet (UV) illumination. The AlGaN/GaN HEMT was fabricated on the sapphire substrate, and corresponding structural and electrical properties were investigated. Subsequently, the optimization of MoS2 concentration for device functionalization was carried out by performing sensing analysis of Hg2+ ions on three devices, and it was observed that the 20 mg/mL concentration of MoS2 is optimum for the detection of Hg2+ ions. Furthermore, the detection of Hg2+ ions was performed under UV exposure, where the developed sensor showed much-improved sensitivity of $548.07~\mu \text{A}$ /ppb compared with normal light. The comparative analysis indicates the increase of three orders of magnitude in sensitivity under UV irradiation, and it is the highest sensitivity ever observed by the AlGaN/GaN HEMT sensor for Hg2+ ion detection. Moreover, the sensor also exhibits the limit of detection (LoD) of 6.14 parts per trillion (ppt) that is much lower than the World Health Organization (WHO) standard limit for Hg2+ ions in drinking water. Due to the photoexcitation process, the generation of electron–hole pairs provides more binding sites on the MoS2 surface, which results in the ultrasensitive detection of the Hg2+ ions at trace and ultratrace levels.read more
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Development of semiconductor based heavy metal ion sensors for water analysis: A review
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References
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Journal ArticleDOI
Growth of MoS2–MoO3 Hybrid Microflowers via Controlled Vapor Transport Process for Efficient Gas Sensing at Room Temperature
Rajesh Kumar,Neeraj Goel,Monu Mishra,Govind Gupta,Mattia Fanetti,Matjaz Valant,Matjaz Valant,Mahesh Kumar +7 more
TL;DR: Cui et al. as mentioned in this paper proposed a hybrid MoS2-MoO3 microflower sensor with a low response time (≈19 s) and excellent selectivity toward NO2 against various other gases.
Journal ArticleDOI
Recyclable fluorimetric and colorimetric mercury-specific sensor using porphyrin-functionalized Au@SiO2 core/shell nanoparticles.
TL;DR: The results obtained not only allow a practical sensing application for the Hg(2+) ion but also serve as a guide for the design of fluorimetric/colorimetric sensors for other targets.
Journal ArticleDOI
pH sensor using AlGaN∕GaN high electron mobility transistors with Sc2O3 in the gate region
B. S. Kang,Hung-Ta Wang,Fan Ren,Brent P. Gila,C. R. Abernathy,S. J. Pearton,Jerry W. Johnson,Pradeep Rajagopal,John C. Roberts,Edwin L. Piner,K. J. Linthicum +10 more
TL;DR: In this article, an ungated AlGaN∕GaN high electron mobility transistors (HEMTs) exhibit large changes in current upon exposing the gate region to polar liquids.
Journal ArticleDOI
Hydrothermal synthesis of MoS2 with different morphology and its performance in thermal battery
TL;DR: In this article, three different kinds of hierarchical MoS2 microspheres are successfully synthesized by a simple hydrothermal route, and their morphology, thermal stability and electrochemical performance in thermal battery are characterized.
Journal ArticleDOI
Ultrasensitive and selective electrochemical sensing of Hg(II) ions in normal and sea water using solvent exfoliated MoS2: affinity matters
R. Aswathi,K. Y. Sandhya +1 more
TL;DR: In this paper, solvent exfoliated molybdenum disulphide (MoS2) has been exploited for the electrochemical sensing of mercury(II) ions (Hg2+).