APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xiangyang Yao,Wanli Zhang,Meigui Ou,Chunlin Yang
In this paper, a composite material GQDs/Gd 2 O 3 :Er 3+ /TiO 2 , was prepared by polyol method and hydrothermal method to improve the catalytic performance of TiO 2 . The composite material is analyzed by XRD, SEM, TEM, XPS, RAMAN, UV–Vis and PEC electrochemical test, combined the DFT theoretical calculation simulation. SEM and TEM results show that spherical GQDs/Gd 2 O 3 :Er 3+ nanoparticles are covered on the surface of TiO 2 nanorods. UV–Vis absorption spectra indicates that GQDs/Gd 2 O 3 :Er 3+ broadens the wavelength range of TiO 2 in the wavelength range of 400–1000 nm. The photocurrent density and the applied bias light-electroconversion efficiency of the electrodes of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is 3.47 times and 7.6 times as that of pure TiO 2 , respectively. DFT calculations reveal that the band width of GQDs/Gd 2 O 3 :Er 3+ /TiO 2 is decreased by 2.647 eV compared to pure TiO 2 , resulting in an easier transition of electrons from valence band (VB) to conduction band (CB). Photocatalytic tests show that the degradating efficiency of methylene blue (MB) by GQDs can reach 68.52 %, which is higher than that of pure TiO 2 (61.68 %).
研究领域:
材料科学
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纳米技术
·
光催化
·
电化学
·
光学材料
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Hao Wu,Zengsheng Guo,Ming Li,Guanghui Hu,Tao Tang,Jianfeng Wen,Xinyu Li,Haifu Huang
In this work, we report a strategy for enhancing the pseudocapacitive performance of MoS 2 materials by the introduction of nitrogen-doped graphene quantum dots (N-GQDs) and helical carbon tubes (HCNT). By a simple hydrothermal process, the hybrid composite (MoS 2 , N-GQDs and HCNT) were coated on the carbon cloth (CC) without any binders, which can be directly used as advanced electrode material for high-performance solid-state flexible supercapacitors . In this hybrid structure, N-GQDs are inserted between the layers of MoS 2 nanosheets , which induce and expose more active sites for pseudocapacitance contributions in MoS 2 electrode materials. Meanwhile, HCNT acts as electrically conducting bridge for enhancing the electrical conductivity of MoS 2 nanosheets and speeding up transport of electronic. As results, the hybrid composite (MoS 2 , N-GQDs and HCNT) show higher capacitive performance than pure MoS 2 . The specific capacitance of hybrid composite is high up to 3360 mF cm −2 . Further, the assembled solid-state flexible supercapacitor shows high specific capacitance of 1893 mF cm −2 , outstanding cycle life (capacitance retention of 86% after 2500 cycles), good mechanical stability and great flexibility. Our work provides a reference for the preparation of MoS 2 composites with high supercapacitive performance.
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jianghua Yang,Tao Shao,Cong Luo,Jinling Li,Shijie He,Bowen Meng,Qiankun Zhang,Dongxia Zhang,Zhonghua Xue,Xibin Zhou
Au-GQDs@AgPt Yolk-shell nanostructures with Au-GQDs yolk and AgPt alloy shell have been synthesized through a green wet chemical reduction method. In this process employed Au-GQDs as a yolk to obtain Au-GQDs@Ag nanoparticles (NPs), and then galvanic replacement reaction occurred between PtCl 6 2- and Ag to fabricate Au-GQDs@AgPt Yolk-shell nanostructures. GQDs served as a structure-directing and dispersing agent to prepare homogeneous shell. The electrocatalytic performance of the as-synthesized Au-GQDs@AgPt Yolk-shell nanostructures for methanol oxidation reaction (MOR) is studied by cyclic voltammetry (CV) and chronoamperometry (CA). The catalyst has displayed excellent specific activity (33.20 mA cm −2 ), which is approximately 7 times higher than those of commercial Pt/C. And its CO tolerance and stability for MOR are also greatly improved. The results attribute to their particular structure (Yolk-shell nanostructures), electron effect with Ag and Pt, electron transport between GQDs and AgPt shell. The present strategy can provide an environment-friendly and valuable way to fabricate multicomponent nanostructures with Yolk-shell nanostructures.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2018
·Vol. 19
·期 5
·1633-1639
·
IF 2.617
Ling Kong,Jie Chen,Zhiwei Chen,Jinhui Feng,Dawei Fan,Qin Wei
A new label-free aptasensor with high visible-light photoelectrochemical (PEC) activity was fabricated for the detection of AFB1 based on N-doped graphene quantum dots (N-GQDs) sensitized Zn-doped SnS2 (Zn-SnS2) nanocomposites. N-GQDs sensitized Zn-SnS2 showed an eminent PEC performance. Ascorbic acid was utilized as an efficient electron donor for scavenging photogenerated holes and inhibiting light driven electron-hole pair recombination. Under the optimum experimental conditions, the specific binding between AFB1 aptamer and AFB1 resulted in the linear decrease of photocurrent with the increase of logarithm of AFB1 concentration in the range of 0.01-20 ng mL-1 with a detection limit of 3 pg mL-1. The constructed N-GQDs sensitized Zn-SnS2 PEC aptasensor exhibited high sensitivity, low cost, and good reproducibility, which is a promising platform for the detection of other important analytes.
研究领域:
分析化学
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纳米技术
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食品安全
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 15
·7394-7403
·
IF 6.97
Pengcheng Zhao,Meijun Ni,Chao Chen,Zhidu Zhou,Xiping Li,Chunyan Li,Yixi Xie,Junjie Fei
A temperature-controlled switchable electrochemical sensor was constructed based on a composite film consisting of thermosensitive block polymer poly(styrene-b-(N-isopropylacrylamide)-b-styrene) (PS-PNIPAm-PS), carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) and amino-functionalized graphene quantum dots (N-GQDs). The prepared sensor showed good temperature sensitivity and reversibility in sensing paracetamol. In the low temperature environment, the polymer stretched to bury the electroactive sites of the carbon nanocomposite, and the paracetamol could not pass through the polymer to achieve electronic exchange, representing the “closed” state. Conversely, in the high temperature environment, the polymer shrank to expose the electroactive sites and enlarge background currents, the paracetamol was able to undergo the redox reaction normally and generate the response current, representing the “on” state. In addition, the sensor had a wide detection range (0.1 to 7.0 μM and 7.0 to 103.0 μM) and a low LOD of 66 nM for paracetamol. This switch-like sensor provided a novel idea for the application of thermosensitive polymers.
研究领域:
材料科学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 23
·4074
·
IF 4.329
Duanwei Zhang,Fusheng Liu,Sheng Wang,Mengxi Yan,Xin Hu,Mengying Xu
This article proposes a method of increasing thermal conductivity (λ) by improving the λ value of a matrix and reducing the interfacial thermal resistance between such matrix and its thermally conductive fillers. D-GQDs (graphene quantum dots modified by polyetheramine D400) with a π–π-conjugated system in the center of their molecules, and polyether branched chains that are rich in amino groups at their edges, are designed and synthesized. AlN/DG-ER (AlN/D-GQDs-Epoxy resin) thermally conductive composites are obtained using AlN as a thermally conductive and insulating filler, using D-GQDs-modified epoxy resin as a matrix. All of the thermal conductivity, electrically insulating and physical–mechanical properties of AlN/DG-ER are investigated in detail. The results show that D-GQDs linked to an epoxy resin by chemical bonds can increase the value of λ of the epoxy–resin matrix and reduce the interfacial thermal resistance between AlN and DG-ER (D-GQDs–epoxy resin). The prepared AlN/DG-ER is shown to be a good thermally conductive and insulating packaging material.Keywords:thermal conductivity;graphene quantum dots;AlN;epoxy resin;thermally conductive composites
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Wanfeng Wu,Yanan Qin,Yan Fang,Yukun Zhang,Shuxuan Shao,Fanxing Meng,Minwei Zhang
Currently, graphene quantum dots (GQDs) are widely used as antibacterial agents, and their effects are dependent on the reactive oxygen species (ROS) generated by photodynamic and peroxidase activities. Nevertheless, the supply of substrates or light greatly limits GQDs application. Besides, due to compensatory mechanisms in bacteria, comprehensive analysis of the molecular mechanism underlying the effects of GQDs based on cellular-level experiments is insufficient. Therefore, N-GQDs with inherent excellent, broad-spectrum antibacterial efficacy under acidic conditions were successfully synthesized. Then, via multi-omics analyses, the antibacterial mechanisms of the N-GQDs were found to not only involve generation ROS but also be associated with changes in osmotic pressure , interference with nucleic acid synthesis and inhibition of energy metabolism. More surprisingly, the N-GQDs could destroy intracellular acid-base homeostasis , causing bacterial cell death. In conclusion, this study provides important insights into the antibacterial mechanism of GQDs, offering a basis for the engineering design of antibacterial nanomaterials .
研究领域:
纳米技术
·
细菌学
·
分子生物学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2026
·
IF 11.8
Longlong Qin,Liang Liu,Shengxiang Huang,Xiaohui Gao,Lianwen Deng
Construction of acid-doped polyaniline films with excellent dual-band modulation ability remains extremely challenging. Herein, graphene quantum dots (GQDs) and p-toluenesulfonic acid ( p TSA) are co-doped in electrodeposited polyaniline (PANI) films, transforming the compact PANI layer into an interconnected porous network. The reconstructed morphology facilitates electrolyte accessibility and shortens ion-transport pathways, while the interfacial interactions among GQDs, p TSA, and PANI promote localized charge redistribution and charge transport. These synergistic morphological and electronic effects contribute to accelerated electrochemical kinetics and enhanced electrochromic performance. The optimized film exhibits a maximum optical contrast (ΔT) of 47.6% at 667 nm and a high coloration efficiency of 203.2 cm 2 C −1 in the potential range from −0.2 to +0.3 V. Meanwhile, a broad infrared emissivity modulation range (Δε) and a maximum temperature tunable range was obtained as 0.71°C and ±8°C, respectively. Furthermore, an interpretable machine-learning framework integrating composition, morphology, and transport descriptors was established for multi-property prediction and composition screening, with its predictive capability further evaluated by independent blind validation. The results reported in this work provide an effective strategy and concept for advanced electrochromic materials toward applications in smart windows and adaptive thermal management systems.
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DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Aoli Liu,Zelong Dai,Danlin Ouyang,Binod Mahara,Lishan Yang,Xiangping Chen
The rapid growth of lithium-ion batteries (LIBs) has created critical environmental and resource management challenges, particularly due to the underutilization of spent graphite (SG) anodes. Herein, we develop a defect-activated upcycling strategy that transforms SG into high-value spent graphene quantum dots (SGQDs) by harnessing its electrochemical cycling-induced multiscale defects. These native imperfections, such as lattice vacancies, interlayer expansion, and SEI residues, serve as reactive sites that promote uniform exfoliation and oxidation during the modified Hummers process. This facilitates the production of spent graphene oxide (SGO) with enhanced oxidation degree and effective retention of defect structures. Subsequent hydrothermal treatment yields ultrasmall SGQDs with high crystallinity, excitation-independent emission, and superior fluorescence quantum yield and lifetime, outperforming counterparts derived from pristine commercial graphite. Notably, the SGQDs exhibit excellent environmental tolerance, including strong salt/pH stability, and demonstrate high sensitivity and selectivity toward metal ions such as Al³⁺ and Fe³⁺. A comprehensive life cycle analysis (LCA) confirms that this upcycling approach reduces energy and greenhouse gas emissions by over 70% while generating substantial economic value. This study introduces a scalable, defect-guided conversion pathway for spent graphite, offering new insights into defect engineering and enabling sustainable, high-performance nanomaterial production from battery waste.
研究领域:
材料科学
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环境科学与工程
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纳米材料
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可持续能源
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废物资源化
·
电化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Shunshun Bao,Shaoze Zhi,Xueying Yang,Yinfeng Wang,Zhengchun Yang,Jun Liu,Peng Pan,Yangyang Qi,Jie He
This study presents an electrochemiluminescence (ECL) sensing platform based on graphene quantum dots/silver nanoparticles (GQDs/AgNPs) composites, combined with a lightweight deep learning model within a portable detection system to achieve highly sensitive point-of-care monitoring of methimazole (MMI). By utilizing the synergistic effect of GQDs interface modification and AgNPs localized surface plasmon resonance (LSPR), the sensor significantly enhances the ECL signal intensity of tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy) 3 2+ ) on paper-based electrodes, while exhibiting excellent stability. In addition, for the problem of uneven luminescent spot distribution and edge blurring in ECL images, we use an improved U-Net neural network model to achieve accurate extraction of the center bright luminescent spot through sub-pixel level segmentation and background noise suppression. The detection system utilizes a Raspberry Pi core with a 3D printing module to significantly reduce the time and cost per test, and achieves a detection limit of 0.327 nM (linear range: 10 −9 – 10 −3 M). Through the design strategy of “material-algorithm-system”, this study provides a highly sensitive, stable and practical solution for monitoring drug concentrations in the urine of hyperthyroid patients, which promotes the implementation of precision medicine in primary care.
研究领域:
分析化学
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纳米技术
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生物医学工程
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电化学
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机器学习
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药物分析
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lijun Wang,Jing Cao,Zhenni Yu,Haixia Hu,Xiao Yang,Xianggui Chen
The newly established lower maximum residue limit (MRL) for thiamethoxam (TMX) necessitates the development of more sensitive detection methods. This study presents a novel colorimetric-fluorescence sensing platform to detect TMX through graphene quantum dot (GQD)-mediated regulation of Fe 3 O 4 @Cu@PLL nanozyme activity. The mechanism investigation revealed that GQDs effectively suppress the peroxidase-like activity of Fe 3 O 4 @Cu@PLL by reducing and scavenging hydroxyl radicals (•OH) generated during catalytic reactions, which constitutes the fundamental principle of the dual-mode detection strategy. The sensing system was constructed through the hybridization of aptamer-functionalized Fe 3 O 4 @Cu@PLL (Fe 3 O 4 @Cu@PLL/Apt) with complementary DNA strand-modified GQDs (CS-GQDs), forming Fe 3 O 4 @Cu@PLL/Apt-CS/GQDs complexes. Following magnetic separation, two distinct detection channels were established: (1) The supernatant showed negligible fluorescence due to CS-GQDs removal, while (2) the precipitates exhibited suppressed peroxidase-like activity owing to GQD-induced inhibition. However, TMX presence triggered the dissociation of CS-GQDs from the complexes through competitive binding with the aptamer. This resulted in two measurable signals: a fluorescence signal recovery at 450 nm in the supernatant containing CS-GQDs, and restored nanozyme activity in the Fe 3 O 4 @Cu@PLL/Apt+TMX precipitates that catalyzed H 2 O 2 -mediated oxidation of TMB to blue-colored oxTMB. The optimized system achieved detection limits of 8 ng/mL (colorimetric) and 6 ng/mL (fluorescence), demonstrating high sensitivity. Validation experiments using three spiked samples (tea, beans, and kumquats) showed satisfactory recoveries ranging from 94.59 % to 108.23 %, confirming the method's reliability for accurate, on-site TMX detection in food matrices.
研究领域:
分析化学
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食品安全
·
纳米生物技术
·
农药残留检测
·
分子识别
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 127
·期 6
·1-10
·
IF 2.584
Liu Yurong,Niu Shaoyu,Hu Rong
In this work, the ferric cobalt sulfide/aminated graphene quantum dots (FeCo 2 S 4 /NH 2 -GQDs) nanoflowers grown on Ni foam substrate have been successfully fabricated via a facile two-step hydrothermal method. The as-prepared FeCo 2 S 4 /NH 2 -GQDs nanoflowers can expose plenty of electroactive sites, provide fast charge transfer paths and buffer the drastic volume change during long-term charge–discharge cycles. Therefore, the FeCo 2 S 4 /NH 2 -GQDs nanoflowers exhibit excellent supercapacitive performance, including high specific capacitance, excellent rate capability and cycling stability. The specific capacitance of FeCo 2 S 4 /NH 2 -GQDs composite electrode reaches 2314.8 and 1802.5 F g −1 at the current density of 1 and 10 A g −1 , respectively, while maintaining superior cycling stability with 95.1% capacitance retention after 5000 cycles. This study proves that NH 2 -GQDs are promising materials to enhance the electrochemical performance of bimetallic sulfides, providing a new insight for the design and fabrication of novel electrode materials for high-performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
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