A novel strategy for the detection of tert-butylhydroquinone based on graphene quantum dots and silver nanoparticle modified glass carbon electrode

2015 ◽  
Vol 93 (6) ◽  
pp. 648-654 ◽  
Author(s):  
Xiuli Niu ◽  
Wu Yang ◽  
Hao Guo ◽  
Jie Ren ◽  
Jing Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electron Transfer ◽  
Modified Electrode ◽  
Silver Nanoparticle ◽  
Graphene Quantum Dots ◽  
Surface Concentration ◽  
Glass Carbon Electrode ◽  
Glass Carbon ◽  
One Step ◽  
Novel Strategy

Graphene quantum dots (GQDs) were synthesized by a facile one-step wet chemically derived from carbon fibers. A novel, sensitive, simple, and convenient method for the detection of tert-butylhydroquinone (TBHQ) was established based on GQDs and silver nanoparticle (AgNP) modified electrode. The modified electrode exhibited excellent electrocatalytic performance toward the electrochemical detection of TBHQ. Meanwhile, a possible reaction mechanism related to the oxidation of TBHQ was proposed. The electron transfer number and electron transfer coefficient were found to be 3.05 and 0.40. The surface concentration of TBHQ on GQD/AgNP-modified electrode was calculated as 2.62 × 10−10 mol cm−2. Under the optimum conditions, a good linear relationship between peak current and the concentration of TBHQ was obtained in the range of 0.15–300 μmol L–1 with a detection limit of 0.07 μmol L–1 (S/N = 3). The proposed method was successfully applied for the detection of TBHQ in edible vegetable oil.

Molybdenum Trioxide Dihydrate-Graphene Composite for Electrochemical Detection of Thiourea Molecule

NANO ◽  
2016 ◽  
Vol 11 (03) ◽  
pp. 1650036 ◽  
Author(s):  
Xinmeng Zhang ◽  
Kezhi Li ◽  
Hejun Li ◽  
Jinhua Lu ◽  
Leilei Zhang
Keyword(s):  
Electrochemical Sensor ◽  
Modified Electrode ◽  
Molybdenum Trioxide ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
X Ray ◽  
Glass Carbon Electrode ◽  
Graphene Composite ◽  
Relative Standard ◽  
Glass Carbon

A novel electrochemical sensing platform was constructed based on a facile self-assembly procedure synthetic laminar molybdenum trioxide dihydrate (MoO[Formula: see text]H2O)-graphene composite. Field emission scanning electron microscopy (FESEM), X-ray spectroscopy, X-ray diffraction (XRD) and Raman spectroscopy were employed to characterize the morphology and composition of the MoO[Formula: see text]H2O-graphene composite. As a model molecule, thiourea was utilized to investigate the electrochemical behaviors of the MoO[Formula: see text]H2O-graphene composite modified glass carbon electrode. The results show that the composite modified electrode has higher electron transfer rate than that of graphene modified electrode and bare glass carbon electrode meanwhile the peak currents of it has a good linear relationship with thiourea concentrations in the range of [Formula: see text] ([Formula: see text]) with detection limit of 4.99[Formula: see text][Formula: see text]M ([Formula: see text]). This novel electrochemical sensor exhibits a higher absorption capacity ([Formula: see text][Formula: see text]mol/cm2), a good reproducibility (1.41% relative standard deviation (RSD)), excellent anti-interference and a high stability. These excellent electrochemical properties of the MoO[Formula: see text]H2O-graphene composite are attributed to the loose and porous structure and the synergistic effects between graphene and MoO[Formula: see text]H2O, which make this composite material hold great potential applications for electrochemical sensor.

One step electro-oxidative preparation of graphene quantum dots from wood charcoal as a peroxidase mimetic

Talanta ◽  
2017 ◽  
Vol 173 ◽  
pp. 36-43 ◽  
Author(s):  
Narsingh R. Nirala ◽  
Gaurav Khandelwal ◽  
Brijesh Kumar ◽  
Vinita ◽  
Rajiv Prakash ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Wood Charcoal ◽  
Peroxidase Mimetic ◽  
One Step

scholarly journals One-Step Synthesis of Diamine-Functionalized Graphene Quantum Dots from Graphene Oxide and Their Chelating and Antioxidant Activities

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 104 ◽  
Author(s):  
Rabeb El-Hnayn ◽  
Laetitia Canabady-Rochelle ◽  
Christophe Desmarets ◽  
Lavinia Balan ◽  
Hervé Rinnert ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Colloidal Stability ◽  
Antioxidant Activities ◽  
Graphene Quantum Dots ◽  
Average Diameter ◽  
Functionalized Graphene ◽  
One Step ◽  
Low Cytotoxicity ◽  
Health Applications

2,2’-(Ethylenedioxy)bis(ethylamine)-functionalized graphene quantum dots (GQDs) were prepared under mild conditions from graphene oxide (GO) via oxidative fragmentation. The as-prepared GQDs have an average diameter of ca. 4 nm, possess good colloidal stability, and emit strong green-yellow light with a photoluminescence (PL) quantum yield of 22% upon excitation at 375 nm. We also demonstrated that the GQDs exhibit high photostability and the PL intensity is poorly affected while tuning the pH from 1 to 8. Finally, GQDs can be used to chelate Fe(II) and Cu(II) cations, scavenge radicals, and reduce Fe(III) into Fe(II). These chelating and reducing properties that associate to the low cytotoxicity of GQDs show that these nanoparticles are of high interest as antioxidants for health applications.

Ag-Conjugated graphene quantum dots with blue light-enhanced singlet oxygen generation for ternary-mode highly-efficient antimicrobial therapy

2020 ◽  
Vol 8 (7) ◽  
pp. 1371-1382 ◽  
Author(s):  
Yunjian Yu ◽  
Lin Mei ◽  
Yanmei Shi ◽  
Xinge Zhang ◽  
Kesong Cheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Singlet Oxygen ◽  
Blue Light ◽  
Silver Nanoparticle ◽  
Broad Spectrum ◽  
Antimicrobial Therapy ◽  
Graphene Quantum Dots ◽  
Oxygen Generation ◽  
Singlet Oxygen Generation ◽  
Highly Efficient

A broad-spectrum antibacterial system was produced in which silver nanoparticle-conjugated graphene quantum dots were utilised as a blue light-enhanced nanotherapeutic for efficient ternary-mode antimicrobial therapy.

Boron-doped Graphene quantum dots modified electrode for electrochemistry and electrocatalysis of hemoglobin

2018 ◽  
Vol 823 ◽  
pp. 137-145 ◽  
Author(s):  
Wei Chen ◽  
Wenju Weng ◽  
Xueliang Niu ◽  
Xiaoyan Li ◽  
Yongling Men ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Modified Electrode ◽  
Graphene Quantum Dots ◽  
Boron Doped ◽  
Doped Graphene
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