ADVANCED MATERIALS
·
2024
·Vol. 36
·期 25
·2400396
·
IF 27.4
Jingwen Ba,Hongliang Dong,Mateusz Odziomek,Feili Lai,Rui Wang,Yandong Han,Jinfu Shu,Markus Antonietti,Tianxi Liu,Wensheng Yang,Zhihong Tian
The oligomers of carbon suboxide, known as red carbon, exhibit a highly conjugated structure and semiconducting properties. Upon mild heat treatment, it transforms into a carbonaceous framework rich in oxygen surface terminations, called oxocarbon. In this study, the abundant oxygen functionalities are harnessed as anchors to create oxocarbon-supported nanohybrid electrocatalysts. Starting with single atomic Cu (II) strongly coordinated to oxygen atoms on red carbon, the Fehling reaction leads to the formation of Cu 2 O clusters. Simultaneously, a covalent oxocarbon framework emerges via cross-linking, providing robust support for Cu 2 O clusters. Notably, the oxocarbon support effectively stabilizes Cu 2 O clusters of very small size, ensuring their high durability in acidic conditions and the presence of ammonia. The synthesized material exhibits a superior electrocatalytic activity for nitrate reduction under acidic electrolyte conditions, with a high yield rate of ammonium (NH 4 + ) at 3.31 mmol h −1 mg cat −1 and a Faradaic efficiency of 92.5% at a potential of −0.4 V (vs RHE).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
He Li,Hong-Gang Ye,Rui Cheng,Jiazhuang Guo,Zhi-Bin Liang,Ge Li,Qing Li,Cai-Feng Wang,Su Chen
Carbon dots have been rapidly developed as a kind of luminescent nanomaterials . However, methods for the synthesis of long-wavelength-emissive carbon dots are still not mature enough. Meanwhile, developing a fast and highly sensitive method to detect residual veterinary drugs in food is particularly significant for food safety. Herein, we report the facile fabrication of red-emissive carbon dots (R-CDs) for ratiometric sensing of veterinary drugs. With use of sorbitol and o -phenylenediamine as precursors, R-CDs was prepared via a one-pot solvothermal approach. The resulting R-CDs show mainly excitation-independent and dual-emissive photoluminescence (PL) located at 597 and 645 nm. Meanwhile, the PL quantum yield (QY) of R-CDs without further surface treatment is 33% under 540 nm excitation. Interestingly, the R-CDs exhibit fast fluorescence response to malachite green oxalate (MG oxalate), 1-aminohydantoin hydrochloride (AHD) and pefloxacin , which are abused widely and retained easily in animals. Ratiometric sensing of these veterinary drugs were successfully performed taking the advantage of dual-emissive PL property; the detection limits of MG oxalate, AHD and pefloxacin were 0.79, 0.25 and 0.85 μM, respectively.
研究领域:
食品安全
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纳米材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Min Yu,Hui Zhang,Yingnan Liu,Yalan Zhang,Minghui Shang,Li Wang,Yuting Zhuang,Xin Lv
Nitrite (NO 2 – ) is widely present in the human environment and accurate, sensitive and selective detecting of nitrite is of vital significance for food safety and water quality. Herein, a novel red emission carbon dots (r-CDs) fluorescent probe was fabricated for dual-mode detection of nitrite, which was capable of both convenient colorimetric analysis and accurate fluorometric detection. When NO 2 – is added to the rose-red r-CDs solution, NO 2 – interacts with the amino groups which on the surface of r-CDs to form diazotized substance, resulting in that the colorimetric color of r-CDs solution realizes the transition from rose red to light purple, and the red fluorescence is gradually quenched. The detection limits of colorimetric and fluorescence for NO 2 – were 0.193 μM and 0.149 μM, respectively. Furthermore, the dual-readout probe revealed satisfactory recovery and reliability when analyzing the concentration of NO 2 – in ham and bacon samples..
研究领域:
分析化学
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食品科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 21
·215704
·
IF 3.551
Xuyan Lan,Hua Ren,Xin Yang,Jue Wang,Peili Gao,Yong Zhang
Microwave approach has been widely used for the synthesis of fluorescent carbon dots (CDs) due to its advantages of short reaction time and homogeneous heating. Currently, it is still difficult to synthesize red light-emitting CDs (R-CDs) via the microwave-assisted method at atmospheric pressure. Herein, we report a solvent-controlled synthesis of R-CDs using domestic microwave. As a result, for an ammonium citrate tribasic, formamide and glycerol blend reaction solvent, the R-CDs with emission peak of 622 nm were achieved and exhibited a photoluminescence (PL) quantum yield of 37.4% and excitation-independent PL emission spectrum. During the formation process of R-CDs, glycerol and formamide not only promote the carbonization of ammonium citrate tribasic, but can also enhance the crystalline nature of CDs. Finally, the warm white light-emitting diode (WLED) with a high colour rendering index (CRI) of 90.9 and Commission Internationale de L'Eclairage (CIE) coordinates of (0.344, 0.333) was realized by combining conventional yellow YAG:Ce phosphor and R-CDs/mesoporous silica (MPS) composites with a blue chip. This result demonstrates a low-cost R-CD synthetic method for potential substitution for red phosphor materials in solid-state lighting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 7
·3050-3058
·
IF 3.069
Qingwen Guan,Rigu Su,Miaoran Zhang,Rui Zhang,Weijun Li,Dong Wang,Meng Xu,Ling Fei,Quan Xu
Heteroatom-doped carbon dots (CDs), due to their excellent fluorescence performance and multifunctional characteristics, have always been a focus of scientists. Herein, we reported a facile one-step solvothermal method for the synthesis of dual-emission nitrogen and sulfur co-doped (N,S)-CDs with a photoluminescence quantum yield (PLQY) of 29.7%. The synthesized CDs retain highly excitation-independent properties at a wide range of excitation wavelengths. To further investigate the optical properties and surface chemistry of the (N,S)-CDs, several characterization methods were used in this study, including fluorescence spectrophotometry, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Raman spectroscopy. The as-prepared (N,S)-CDs exhibited two obvious maximum emission wavelengths of 600 and 650 nm with the best excitation wavelength of 560 nm, and emitted bright red fluorescence under UV light (365 nm). The (N,S)-CDs were developed into WLEDs with a comparable CRI and as a sensitive sensor for water in ethanol, suggesting the outstanding application prospects of the as-synthesized (N,S)-CDs.
研究领域:
材料科学
·
光学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 47
·22335-22343
·
IF 3.591
Siqi Wei,Haoyi Li,Xinghang Yin,Qiang Yang,Anli Chen,Renjie Li,Jing Wang,Rui Yang
Synthesizing high-efficiency red carbon dots (R-CDs) and exploring their photoluminescence mechanism remain challenges as well as critical issues hindering the development of red room-temperature phosphorescence (RTP) materials of CDs. Herein, a series of highly efficient R-CDs are prepared from citric acid and formamide by solvothermal method on account of the protective and destructive effects of solvents. The larger sp2 conjugated domains of the carbon core and the high content of graphitic N are identified as the key factors for R-CDs to exhibit red fluorescence. Surface groups also contribute to red emission by means of the formation of the N, O-related defect state. By establishing N-doping models and using DFT calculation, it is further demonstrated that the strong p–π conjugation effect caused by the non-bonding electrons of graphitic N would facilitate HOMO–LUMO splitting of the carbon core, thus leading to a significant decrease in the HOMO–LUMO gap. Energy level splitting could lead to a certain degree of energy level crossing, which could contribute to effective intersystem crossing and produce red RTP. From this, the potential applications of R-CDs in the information encryption field are proposed and demonstrated.
研究领域:
材料科学
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光电技术
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纳米技术
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化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Biru Chen,Lei Li,Yue Hu,Bolin Liu,Ming Guo,Qi Zhang,Qianqian Yang,Mingcui Zhang
Diethyl phthalate (DEP), as the environmental endocrine, would interfere with people’s endocrine system and has greatly harm in health. Here a sensitivity, eco-friendly fluorescence immunoassay technique was established based on “turn-on” red carbon dots (R-CDs) conjugated anti-DEP antibody (Ab) as the immunoprobe for the detection of DEP in daily supplies. The R-CDs will “turn-on” fluorescence when it in formamide solution, due to the change of the electron distribution on the surface and electronic charge transfer of the red carbon dots. The use of “turn-on” R-CDs as immunoprobe effectively increased the sensitivity of the immunoassay. Moreover, the R-CDs conjugated anti-DEP Ab without any additional embellishment. Under the optimal conditions, a good linear was established with the DEP concentration range of 5 × 10 −2 ng/mL–10 ng/mL, the low limit of detection (LOD) of the proposed method was 0.0056 ng/mL. This project has satisfactory accuracy with recoveries ranging from 96.0% to 115.1%. Our research provides an accurately, simply and sensitivity strategy to detect the content of environmental endocrine DEP in daily supplies.
研究领域:
分析化学
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环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Haotian Tan,Wei Peng,Tao Zhang,Yonghuan Han,Lichang Yin,Wenping Si,Ji Liang,Feng Hou
Polymeric carbon nitride photocatalyst has attracted much attention due to its visible light response and high chemical stability. However, bulk carbon nitride has a wide band gap and low polymerization, limiting its photocatalytic performance for water splitting. Synthesizing highly polymerized carbon nitride with a narrow band gap still remains challenging. Herein, we propose an ionothermal protocol using supramolecular precursors to fabricate highly polymerized wine-red carbon nitride (WRCN) nanosheets. Both theoretical and experimental investigations revealed that the supramolecular precursor with a high C:N ratio leads to an upward shift of the valence band edge, while the ionothermal synthesis promotes a high polymerization degree, leading to a narrow band gap of 1.82 eV for WRCN. Benefiting from enhanced light absorption and charge separation efficiency, WRCN-loaded hematite photoanode exhibits a much higher photocurrent density than both pristine hematite and bulk carbon nitride decorated hematite. This work may provide a novel strategy to manipulate the electronic structures of carbon nitrides for enhanced photoelectrochemical performances.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yuechen Zhai,Yi Wang,Di Li,Ding Zhou,Pengtao Jing,Dezhen Shen,Songnan Qu
Exploration of solid-state efficient red emissive carbon dots (CDs) phosphors is strongly desired for the development of high performance CDs-based white light-emitting diodes (WLEDs). In this work, enhanced red emissive CDs-based phosphors with photoluminescence quantum yields (PLQYs) of 25% were prepared by embedding red emissive CDs (PLQYs of 23%) into polyvinyl pyrrolidone (PVP). Because of the protection of PVP, the phosphors could preserve strong luminescence under long-term UV excitation or being mixed with conventional packaging materials . By applying the red emissive phosphors as the color conversion layer, WLEDs with high color rendering index of 92 and color coordinate of (0.33, 0.33) are fabricated.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Long Yu,Pengchen Su,Shuyi Huang,Xin Li,Ranhao Yin,Ning Wang,Mingtai Sun,Suhua Wang
A new type of purple-red carbon sphere was synthesized by efficient and convenient methods, which was designed as a colorimetric and fluorescent probe for the detection of hypochlorite, further expanding the application range of carbon spheres. This rare purple-red carbon sphere has a relatively long absorption wavelength, facilitating the design of a highly sensitive fluorescent probe through the energy transfer mechanism. When the probe reacts with hypochlorite, the purplish red color of the carbon ball fades, thus preventing the energy transfer process. More importantly, the alkaline environment provided by hypochlorite also further increases the fluorescence intensity , which was verified by density functional theory (DFT). Finally, a highly selective and ultrafast fluorescent turn-on and colorimetric probe was designed for the detection of hypochlorite in tap water.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2020
·Vol. 145
·期 7
·2661-2668
·
IF 3.978
Hongzhi Lu,Shoufang Xu
A simple core shell structured fluorescent sensor was constructed to realize simultaneous detection of hexavalent and trivalent chromium ions. Briefly, blue-carbon dots (b-CDs) were embedded into a silica sphere, then a Cr(III) imprinted silica layer doped with red-CDs (r-CDs) was coated onto the b-CDs@SiO2. Cr(VI) can selectively quench b-CDs based on the inner filter effect and Cr(III) can selectively quench r-CDs based on electron transfer with the aid of the ion imprinting technique. In this strategy, it was not necessary to reduce Cr(VI) to Cr(III) or oxidize Cr(III) to Cr(VI), the chromium speciation of both can be detected simultaneously. When Cr(VI) was detected in the blue channel, the fluorescence intensity quenching effect was seen at 440 nm, and was linear from 0.01 to 10.0 μM, with a detection limit of 3.8 nM. For the detection of Cr(III) in the red channel, the fluorescence intensity quenching effect was seen at 605 nm, and was linear from 0.1 to 15.0 μM, with a detection limit of 46 nM. This strategy enjoyed the advantages of simple construction, convenient detection, good selectivity and high sensitivity.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2023
·Vol. 148
·期 10
·2375-2386
·
IF 4.2
Yuwei Du,Lei Cao,Xinlu Li,Tongtong Zhu,Ruhong Yan,Wen-Fei Dong,Li Li
Carbon dots (CDs) with red fluorescence emission are highly desirable for use in bioimaging and trace- substance detection, with potential applications in biotherapy, photothermal therapy, and tumor visualization. Most CDs emit green or blue fluorescence, thus limiting their applicability. We report a novel fluorescent detection platform based on high-brightness red fluorescence emission carbon dots (R-CDs) co-doped with nitrogen and bromine, which exhibit pH and oxidized L-glutathione (GSSG) dual-responsive characteristics. The absolute quantum yield of the R-CDs was as high as 11.93%. We discovered that the R-CDs were able to detect acidic pH in live cells and zebrafish owing to protonation and deprotonation. In addition, GSSG was detected in vitro over a broad linear range (8–200 μM) using the R-CDs with excitation-independent emission. Furthermore, cell imaging and bioimaging experiments demonstrated that the R-CDs were highly cytocompatible and could be used as fluorescent probes to target lysosomes and nucleolus. These studies highlight the promising prospects of R-CDs as biosensing tools for bioimaging and trace-substance detection applications.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
分析化学
·
生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）