Au-mediated Z-scheme TiO2-Au-BiOI photoelectrode for sensitive and selective photoelectrochemical detection of L-cysteine

Xin, Yanmei; Wang, Zhuo; Yao, Haizi; Liu, Wanting; Miao, Yuqing; Zhang, Zhonghai; Wu, Dan

doi:10.1016/j.snb.2023.134285

Cited by 12 publications

(6 citation statements)

References 45 publications

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“…Serum was diluted 10 times in a phosphate-buffered solution (0.1 M, pH = 7.0) as a test sample, and a certain amount of L-cysteine standard solution (0, 5, 10, and 20 μM) was added to the human serum sample through the standard addition method. The results are shown in Table 2 , and they are consistent with the reported concentration range of cysteine in serum (30–200 M) [ 58 ]. The corresponding recovery rate results range between 98.5% and 103.3%, and the relative standard deviation (RSD) ranges between 1.8% and 4.7%.…”

Section: Resultssupporting

confidence: 88%

Spherical Silver Nanoparticles Located on Reduced Graphene Oxide Nanocomposites as Sensitive Electrochemical Sensors for Detection of L-Cysteine

Hua,

Yao,

Yao

2024

Sensors

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A new, simple, and effective one-step reduction method was applied to prepare a nanocomposite with spherical polycrystalline silver nanoparticles attached to the surface of reduced graphene oxide (Ag@rGO) at room temperature. Equipment such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR) was used to characterize the morphology and composition of the Ag@rGO nanocomposite. A novel electrochemical sensor for detecting L-cysteine was proposed based on fixing Ag@rGO onto a glassy carbon electrode. The electrocatalytic behavior of the sensor was studied via cyclic voltammetry and amperometry. The results indicate that due to the synergistic effect of graphene with a large surface area, abundant active sites, and silver nanoparticles with good conductivity and high catalytic activity, Ag@rGO nanocomposites exhibit significant electrocatalytic activity toward L-cysteine. Under optimal conditions, the constructed Ag@rGO electrochemical sensor has a wide detection range of 0.1–470 μM for L-cysteine, low detection limit of 0.057 μM, and high sensitivity of 215.36 nA M−1 cm−2. In addition, the modified electrode exhibits good anti-interference, reproducibility, and stability.

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Section: Resultssupporting

confidence: 88%

Spherical Silver Nanoparticles Located on Reduced Graphene Oxide Nanocomposites as Sensitive Electrochemical Sensors for Detection of L-Cysteine

Hua,

Yao,

Yao

2024

Sensors

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“…The bandgaps of TNTs and TNTs/OVs were calculated to be 3.2 and 3.0 eV (Figure S5), respectively. The E VB of TNTs could be calculated from the equation E VB = χ – E e + 0.5Eg, where E e is the hydrogen-scale free electron energy (∼4.5 eV vs NHE) and χ represents the semiconductor electronegativity (χ TNTs = 5.81 eV) . Combined with the formula Eg = E VB – E CB , the E VB and E CB of TNTs could be estimated as 2.91 and −0.29 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancies-Induced Antifouling Photoelectrochemical Aptasensor for Highly Sensitive and Selective Determination of α-Fetoprotein

Xin,

Wang,

Yao

et al. 2024

Anal. Chem.

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Accurate measurement of cancer markers in urine is a convenient method for tumor monitoring. However, the concentration of cancer markers in urine is so low that it is difficult to achieve their measurement. Photoelectrochemical (PEC) sensors are a promising technology to realize the detection of trace cancer markers due to their high sensitivity. Currently, the interference of nonspecific biomolecules in urine is the main reason affecting the high sensitivity and selectivity of PEC sensors in detecting cancer markers. In this work, a strategy of oxygen vacancy (OV) modulation is proposed to construct a fouling-resistant PEC aptamer sensing platform for the detection of α-fetoprotein (AFP), a liver cancer marker. The introduction of OVs induces the formation of intermediate localized states in the photoelectric material, which not only facilitates the separation of photogenerated carriers but also leads to the redshift of the light absorption edge. More importantly, OVs with positive electrical properties can be employed to modify the antifouling layer (C-PEG) with negatively charged groups through an electrostatic interaction. The synergistic effect of OVs, antifouling layer, and aptamer resulted in a TiO 2 / OVs/C-PEG-based PEC sensor achieves a wide linear range from 1 pg/mL to 100 ng/mL and a low detection limit of 0.3 pg/mL for AFP. In addition, the sensor successfully realized the determination of AFP in urine samples and accurately differentiated between normal people and liver cancer patients in the early and advanced stages. This project is of great significance in advancing the application of photoelectrochemical bioanalytical technology to achieve the detection of cancer markers in urine by investigating the construction of an OVs-regulated fouling-resistant sensing interface.

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“…A comparative survey with the previous reported picric acid sensor was done (Table 2), a relatively, vibrant efficient probes like fluorophore containing small organic molecules, polymers, metal complexes, MOFs, cages and other composites are extensively reported [51–83] . However most of these probes are found to be having detection limit in micromolar ranges, with certain drawbacks of interference from other nitroaromatic or heavy metals.…”

Section: Resultsmentioning

confidence: 99%

“…Several techniques were employed but fluorescence technique was found more effective over the other methods owing to its simple methodology, cost effectiveness, low time consumption, ease in handling, and high sensitivity both optical and quantitative measurement and most promisingly adopted for field testing. [12][13][14][15][16] Few fluorescent based sensors have been developed in the past for quantitative detection of picric acid [17][18][19][20][21][22][23][24][25][26][27][28] such as meso-diaminophenyl derived BODIPY(a), [29] pentacenequinone(b), [30] Zwitterionic squaraine(c), [31] acridine derivative(d), [32] naphthahydrin(e-(i),(ii)), [33] as shown in the scheme 1; rhodamine-isonicotinic hydrazide, [34] and carbazole-N,N-dimethylbenzamine chalcone. [35] Carbazole derivatives are successfully employed as organic photoconductors, photorefractive materials in OLEDs and nonlinear optical materials.…”

Section: Introductionmentioning

confidence: 99%

A Straight Green Fluorescent N,N‐Dimethylbenzamine ‐ Carbazole Probe for Recognition of Explosive Picric Acid

Leslee,

Bharathi Kuppannan,

Karuppannan

2023

ChemistrySelect

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The sensor 4‐(9H‐carbazol‐9‐yl)‐N,N‐dimethylbenzenamine, CNDMA a green fluorescent ligand developed for selective sensing of picric acid in DMSO/H2O (1 : 9) over different other nitroaromatic compounds. The sensing mechanism involves emission quenching significantly in the presence of picric acid with a color change from green to non‐fluorescent yellow. The sensing process drives through electrostatic and Hydrogen bonding interaction with formation of an Electron Donor‐Acceptor complex. In addition, inner filter effect also play role on the fluorescence quenching. The fluorescence quenching is a mixed‐type of both static and dynamic quenching process. The binding nature was figured out using the 1H NMR and FTIR titration studies. In addition the sensor showed good quenching efficiency and quenching constant with a lowest detection limit (LOD) of 5.09×10−8 M (R=0.99964) at 358 nm. Test strip experiment is demonstrated to understand the practical feasibility of the sensor.

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Au-mediated Z-scheme TiO2-Au-BiOI photoelectrode for sensitive and selective photoelectrochemical detection of L-cysteine

Cited by 12 publications

References 45 publications

Spherical Silver Nanoparticles Located on Reduced Graphene Oxide Nanocomposites as Sensitive Electrochemical Sensors for Detection of L-Cysteine

Spherical Silver Nanoparticles Located on Reduced Graphene Oxide Nanocomposites as Sensitive Electrochemical Sensors for Detection of L-Cysteine

Oxygen Vacancies-Induced Antifouling Photoelectrochemical Aptasensor for Highly Sensitive and Selective Determination of α-Fetoprotein

A Straight Green Fluorescent N,N‐Dimethylbenzamine ‐ Carbazole Probe for Recognition of Explosive Picric Acid

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