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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Journal ArticleDOI
Development of semiconductor based heavy metal ion sensors for water analysis: A review
TL;DR: In this article, the authors introduce the recent trends in heavy metal ion sensing with semiconductor devices, including ion-sensitive field effect transistors (ISFETs) and AlGaN/GaN high electron mobility transistors(HEMTs) and semiconductor materials like graphene, two-dimensional metal dichalcogenides, decorated with different nanoparticles with appropriate functionalization.
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References
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A novel rhodamine-based optical probe for mercury(II) ion in aqueous medium: A nanomolar detection, wide pH range and real water sample application.
Sagar K. Patil,Dipanwita Das +1 more
TL;DR: New chemosensor RPy, containing the rhodamine and 2,6-pyridinedicarboxaldehyde functionality, is designed and synthesized for the selective detection of mercury (II) (Hg2+) ion in aqueous DMSO solvents with high selectivity and sensitivity over the series of other competing metal ions.
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MPA-GSH Functionalized AlGaN/GaN High-Electron Mobility Transistor-Based Sensor for Cadmium Ion Detection
Adarsh Nigam,Thirumaleshwara N. Bhat,Vijendra Singh Bhati,Surani Bin Dolmanan,Sukant K. Tripathy,Mahesh Kumar +5 more
TL;DR: In this paper, a novel AlGaN/GaN high-electron mobility transistor (HEMT)-based cadmium ion (Cd2+) sensor with mercaptopropionic acid (MPA) and glutathione (GSH) functionalization was demonstrated.
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A selectivity-controlled adsorbent of molybdenum disulfide nanosheets armed with superparamagnetism for rapid capture of mercury ions
Hua Tian,Junhui He,Minghua Hu +2 more
TL;DR: A superparamagnetic molybdenum disulfide (Fe3O4@MoS2) with an expanded interlayer spacing and high magnetic susceptibility for highly selective and rapid uptake of Hg2+ ions is reported, which would enable additional improvement of selectivity by kinetic process engineering.
Journal ArticleDOI
Preparation of 3D assembly of mono layered molybdenum disulfide nanotubules for rapid screening of carbamate pesticide diethofencarb
TL;DR: The developed 3D MoS2NTs nanosensor was successfully used to quantify diethofencarb in river water sample with satisfied recovery of 94.23%-105.46% justifying its analytical utility in pesticide screening.
Book ChapterDOI
Solar Thermal-Driven Cooling Systems
Ioan Sarbu,Calin Sebarchievici +1 more
TL;DR: In this paper, a detailed review of different solar thermal-driven refrigeration and cooling systems is presented, including the theoretical basis and practical applications for cooling systems within various working fluids assisted by solar energy and their recent advances.