Biomass-assisted fabrication of rGO-AuNPs as surface-enhanced Raman scattering substrates for in-situ monitoring methylene blue degradation

Cheng, Xin-Lei; Fu, Ting-Rui; Zhang, Danfeng; Xiong, Jianhua; Yang, Weiqiang; Du, Jie

doi:10.1016/j.ab.2023.115087

Cited by 4 publications

(2 citation statements)

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“…The reaction potentials for the bare electrode and the modified electrode are different, 400 mV for the bare electrode and 200 mV for the modified electrode, indicating that the rGo/AuNPs-modified electrode is more conducive to oxidation-reduction reactions and exhibits significantly improved redox characteristics. 32 However, when AchE is modified on the rGo/AuNPs electrode, the decrease in peak current signal is due to AchE being a protein molecule that shields the electroactivity of the electrode surface and hinders electron transfer, resulting in a decreasing trend in peak current. This confirms the successful attachment of AchE to the electrode.…”

Section: Resultsmentioning

confidence: 99%

Wearable Electrochemical Biosensors for In Situ Pesticide Analysis from Crops

Chen,

Zhou,

et al. 2023

J. Electrochem. Soc.

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On-site monitoring of pesticide presence on the surface of crops is a growing trend in precision and intelligent agriculture. In this study, we prepared a wearable biosensor for in-situ detection of pesticides on surfaces of crops. Here, a flexible fiber membrane substrate was prepared via the electrospinning technology. After the three-electrode system was transferred onto the membrane substrate use screen printing, resulting in a screen printing electrode (SPE) that can effectively adapt to the irregular surface of crops or fruits. By modified the SPE with acetylcholinesterase (AchE), the biosensor showed excellent selectively and recognize for the methyl parathion. To further enhance the electrochemical performance, the surface of the work electrode was modified with gold nanoparticles (AuNPs) and reduced graphene oxide (rGo). The developed wearable sensor successfully detected methyl parathion, showing a good linear relationship within the range of 1 to 2 ppm. The detection limit was measured to be 0.48 ppb, enabling on-site monitoring of pesticide levels in plants. This work presents a straightforward, sensitive, and efficient biosensors to analysis pesticide, which holds potential for application in detecting other agrochemicals. Moreover, this advancement could significantly contribute to the progress of precision agriculture in the future.

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Section: Resultsmentioning

confidence: 99%

Wearable Electrochemical Biosensors for In Situ Pesticide Analysis from Crops

Chen,

Zhou,

et al. 2023

J. Electrochem. Soc.

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“…Comparison of the physical, chemical, and biological methods in the synthesis of AuNPs[62,[69][70][71].…”

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confidence: 99%

Gold Nanoparticle-Based Colorimetric Sensors: Properties and Application in Detection of Heavy Metals and Biological Molecules

Kusuma,

Harmonis,

Pratiwi

et al. 2023

Sensors

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During the last decade, advances have been made in nanotechnology using nanomaterials, leading to improvements in their performance. Gold nanoparticles (AuNPs) have been widely used in the field of sensor analysis and are also combined with certain materials to obtain the desired characteristics. AuNPs are commonly used as colorimetric sensors in detection methods. In developing an ideal sensor, there are certain characteristics that must be met such as selectivity, sensitivity, accuracy, precision, and linearity, among others. Various methods for the synthesis of AuNPs and conjugation with other components have been carried out in order to obtain good characteristics for their application. AuNPs can be applied in the detection of both heavy metals and biological molecules. This review aimed at observing the role of AuNPs in its application. The synthesis of AuNPs for sensors will also be revealed, along with their characteristics suitable for this role. In the application method, the size and shape of the particles must be considered. AuNPs used in heavy metal detection have a particle size of around 15–50 nm; in the detection of biological molecules, the particle size of AuNPs used is 6–35 nm whereas in pharmaceutical compounds for cancer treatment and the detection of other drugs, the particle size used is 12–30 nm. The particle sizes did not correlate with the type of molecules regardless of whether it was a heavy metal, biological molecule, or pharmaceutical compound but depended on the properties of the molecule itself. In general, the best morphology for application in the detection process is a spherical shape to obtain good sensitivity and selectivity based on previous studies. Functionalization of AuNPs with conjugates/receptors can be carried out to increase the stability, sensitivity, selectivity, solubility, and plays a role in detecting biological compounds through conjugating AuNPs with biological molecules.

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