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Results 11-14 of 14 (Search time: 0.001 seconds).

Functionalized silver nanoparticles-based efficient colorimetric platform: Effects of surface capping agents on the sensing response of thiram pesticide in environmental water samples

Authors: Van-Tuan Hoang; Ngo Xuan Dinh; Nguyen Le Nhat Trang; Nguyen Tien Khi; Nguyen Van Quy; Pham Anh Tuan; Doan Quang Tri; Le Hong Thang; Tran Quang Huy; Anh-Tuan Le; Advisor: -; Co-Author: - (2021)

An efficient colorimetric probe based on surface-functionalized silver nanoparticles (AgNPs) was prepared for sensitive thiram pesticide detection in water samples. The influence of various surface capping agents including polyhexamethylene biguanide hydr

Ultrasensitive determination of chloramphenicol in pork and chicken meat samples using a portable electrochemical sensor: effects of 2D nanomaterials on the sensing performance and stability

Authors: Ngo Xuan Dinh; Tuyet Nhung Pham; Tran Quang Huy; Do Quang Trung; Pham Anh Tuan; Vu Quang Khue; Nguyen Van Quy; Van Phan Le; Vu Dinh Lam; Anh-Tuan Le; Advisor: -; Co-Author: - (2021)

Functional two-dimensional (2D) structured nanomaterials, such as, graphene oxide (GO) and molybdenum disulfide (MoS2), exhibit many advantages, including large surface areas and excellent electronic/mechanical/catalytic properties, and have shown to be s

Effect of ferric ion [Fe3+] and [Fe2+] on SO2 adsorption ability of γ-Fe2O3 nanoparticles for mass-type gas sensors

Authors: Nguyen Thanh Vinh; Tran Van Dang; Bui Thi Hang; Anh-Tuan Le; Nguyen Tri Tuan; Le Khanh Vinh; Nguyen Van Quy; Advisor: -; Co-Author: - (2021)

The sensing material plays a very important role in determining the sensing properties of a gas sensor. In order to synthesise the sensing material, the precursors have a large effect on the properties of the sensing material. In this study, three types of γ-Fe2O3 nanoparticles were prepared with different ferric ion concentrations of [Fe3+] and [Fe2+] as precursors, by a typical facile chemical precipitation process and a following annealing treatment. A mass-type gas sensor was fabricated by using a quartz crystal microbalance (QCM) coated with various γ-Fe2O3 nanoparticles. The morphology, crystallisation, and gas adsorption characteristics of the γ-Fe2O3 nanoparticles were investigated. The effect of ferric ion concentrations of [Fe3+] and [Fe2+] on sensing properties is discuss...

Bio-AgNPs-based electrochemical nanosensors for the sensitive determination of 4-nitrophenol in tomato samples: the roles of natural plant extracts in physicochemical parameters and sensing performance

Authors: Nguyen, Le Nhat Trang; Dao, Thi Nguyet Nga; Van-Tuan Hoang; Xuan-Dinh Ngo; Pham, Tuyet Nhung; Anh-Tuan Le; Advisor: -; Co-Author: - (2022)

The present work reports efficient electrochemical nanosensors for the sensitive monitoring of 4-nitrophenol (4-NP) in tomato samples using various biosynthesized silver nanoparticles (bio-AgNPs). Three different bio-AgNP types were synthesized using natural plant extracts, including green tea (GT) leaf, grapefruit peel (GP), and mangosteen peel (MP), aiming to investigate their effects on the formation of bio-AgNPs, as well as the analytical performance of 4-NP. Based on the obtained results, it was found that the phytochemical content in various plant extracts directly influenced the physicochemical parameters of the created bio-AgNPs, such as particle size, crystallinity, and distribution. More importantly, these parameters have decisive effects on the electrocatalytic activity, ...