SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Zhenxing Qin,Wenhai Wang,Ming Wen,Rui Zhang,Qingmei Zhang,Kun Li,Jinhong Li,Wen Yang,Yi Zhou
Multicolor emissive carbon dots (CDs) have potential applications in many fields such as photoelectric display, light-emitting devices, and bioimaging. Such CDs by heteroatom doping of nitrogen elements assisted with various solvents has achieved recently, yet generally low efficiency in red-light region. Herein, we developed a facile route to synthesize multicolor-emissive CDs governed by a solvothermal method of tetrahydrofuran solvent. The maximum emission locates at 432, 510, and 584 nm with the absolute FL QYs up to 21.1%, 11.0%, and 55.4% for selected B-CDs, G-CDs, and YG-CDs, respectively. By means of the analysis on their PL spectra, fluorescence lifetimes , and microstructures, the different graphitic degrees and surface states formed under the participation of S and N elements in as-prepared CDs determine the fluorescent color, and large sp 2 -conjugated domains within the YR-CDs is closely related to high QY. They, likewise, endow the YR-CDs with high sensitivity for ion detections of Ag + and Fe 3+ , which was further illustrated to have different quenching mechanisms each other due to the affinity interaction with different surface groups of the CDs. High PL QYs of these CDs emission are beneficial to application in solid lighting, phosphors dried by these CDs solutions were mixed with PVP water solution to fabricate CDs/PVP films. The films exhibited stable fluorescence, and three phosphors were also mixed together in proportion to obtain white-light film with a CIE coordinates of (0.34, 0.34), which demonstrates that these CDs are potentially fluorescent nanomaterial in the solid-state lighting field.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2021
·
IF 3.785
Jinlong Cui,Yang Qiu,Haibang Zhang,Zhendong Yao,Wenyuan Zhao,Yunying Liu,Juncai Sun
To enhance the comprehensive utilization of agricultural waste in new energy materials, sulfur/nitrogen dual-doped porous C/SiO x composites (SN@C/SiO x ) are successfully prepared via a facile and economical method. In this approach, rice husks are used as the C and Si source and thiourea as the S and N source. This SN@C/SiO x composite possesses a high specific surface area and SiO x particles are evenly distributed in the S/N-doped C matrix. The S/N-doped C matrix not only improves electrical conductivity and impedes the agglutination of particles, but also buffers the volume variation of SiO x , achieving enhanced electrochemical properties . As a lithium-ion battery (LIBs) anode, the as-synthesized SN@C/SiO x composite delivers an impressive specific capacity (1150 mAh/g) and enhanced initial coulombic efficiency (CE) of 70.4%. Even at a large current density of 1.0 A/g, the reversible capacity remains 632 mAh/g after 1200 cycles. This doping carbonization strategy offers the potential for using rice husks in the development of high-performance lithium ion batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiang Miao,Xinlong Yan,Dan Qu,Dabing Li,Franklin Feng Tao,Zaicheng Sun
It is highly desirable and a great challenge for red light emission of carbon dots under long wavelength excitation. Here, we developed a facile route to synthesize carbon dots with red emission due to the doping effect of S and N elements, borrowing from the concept of the semiconductor. The maximum emission locates at 594 nm under 560 nm excitation. The absolute photoluminescence (PL) quantum yield (QY) is as high as 29% and 22% in ethanol and water, respectively. XPS and FTIR spectra illustrated that there exist -SCN and -COOH groups on the surface of the carbon dots. They endow the carbon dots with high sensitivity for ion detection of Fe3+. The quenched PL emission of Fe3+-S,N-CDs can be recovered by adding ascorbic acid to release the -COOH and -SCN group due to Fe2+ formation in the presence of ascorbic acid. High PL QY of red emission is beneficial to application in bioimaging. Doxorubicin was loaded onto carbon dots through π–π stacking to form a theranostic agent. When the CD-Dox was injected into the tumor site, a strong PL emission was observed. The PL intensity indicates the concentration of the theranostic agent. After 7 times injection, both the tumor size and weight clearly decrease. The results demonstrate that the S,N-CDs are a potentially excellent bioimaging component in the theranostic field.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Junxia Guo,Qijian Niu,Yichun Yuan,Inamullh Maitlo,Jun Nie,Guiping Ma
One-dimensional (1D) nanomaterials have gained attention in energy conversion, storage, and catalyst due to the unique physical and chemical properties. Electrospinning is a kind of simple, versatile, and cost-effective technology to fabricate 1D functional nanofibers. Herein, electrospun polyacrylonitrile (PAN), melamine, and ferric chloride hexahydrate (FeCl 3 ·6H 2 O) composite nanofibers are used as template, and polythiophene (PT) are prepared by photopolymerization technology on the surface of electrospun nanofibers as shell part of fibers. Then, the core–shell nanofibers are pyrolyzed and converted into Fe–S/N–C nanofibers, which can be used as catalysts for ORR due to the metal and S-/N-codoped structure and unique 1D structure which provided facile pathways for efficient mass transport and charge transfer. The ORR electrocatalytic ability of Fe–S/N–C nanofibers is tested and present excellent property, especially in stability and methanol crossover. The electrocatalytic ability of sample is comparable to that of 20 wt% Pt/C benchmarks. These results offer an easy pathway for exploring metal-heteroatom-codoped carbon nanofibers applicable for ORR catalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Yao Fan,Wenjun Qiao,Wanjun Long,Hengye Chen,Haiyan Fu,Chunsong Zhou,Yuanbin She
In recent years, antibiotic residues in food have been of great concern to regulators and consumers. In this study, a novel fluorescent sensor based on S, N-doped carbon quantum dots (S, N-CQDs) was established for rapid detection of tetracycline antibiotics (TCs). Through the internal filter effect (IFE), QDs fluorescence can be effectively quenched by TCs, endowing it an “off” condition. Under the optimal conditions, the TC concentration in the range of 1.88–60 μmol/L had a good linear relationship with the change of QDs fluorescence intensity, and the limit of detection (LOD) was calculated as 0.56 μmol/L (S/N = 3). Furthermore, the proposed “Turn-off” sensor could be employed to quickly and accurately quantify TCs residues even in milk, honey and tap water. The recovery rate was as high as between 93.61% and 102.31%. The established sensor has great application value in the fields of food safety and drug analysis, and provides broad prospects for the future food industry.
研究领域:
食品安全
·
药物分析
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
C. Xu,J. Zhan,Z. Wang,X. Fang,J. Chen,F. Liang,H. Zhao,Y. Lei
Na–CO 2 batteries are prospective in energy storage and CO 2 recycling applications; development of a high-efficiency, low-cost electrocatalyst to promote CO 2 reduction and carbonate decomposition is extremely vital for practical Na–CO 2 batteries. Herein, a highly efficient cathode catalyst for rechargeable hybrid Na–CO 2 batteries is successfully synthesized by encapsulating highly dispersed Co/Co 9 S 8 nanoparticles into carbon skeletons, consisting of biomass-derived S, N-co-doped hierarchically porous carbon (Co/Co 9 S 8 @SNHC). The conductive and hierarchically porous framework structure of the Co/Co 9 S 8 @SNHC can not only accelerate electron transport , electrolyte infiltration , and CO 2 diffusion but also can inhibit overgrowth and agglomeration of Co/Co 9 S 8 nanoparticles and expose numerous high density of active sites, as well as offer sufficient space to store discharge products. Benefiting from the synergistic effect among S and N dopants , carbon defects, and Co/Co 9 S 8 nanoparticles in robust porous carbon structure, the hybrid Na–CO 2 batteries displayed a low charge overpotential (only ~0.32 V) at 0.2 mA/cm 2 and repeatedly charged and discharged over 200 cycles at 0.1 mA/cm 2 . Besides, an ultrahigh areal capacity of ~18.9 mAh/cm 2 was obtained at 0.5 mA/cm 2 , the highest value to date for Na–CO 2 batteries. Meanwhile, the hybrid Na–CO 2 battery charging from Na 2 CO 3 @C catalytic cathode demonstrated the high catalytic activity of biomass-derived S,N-co-doped hierarchically porous carbon (Co/Co 9 S 8 @SNHC) for CO 2 reduction and carbonate decomposition. Given this finding, this work might open up a potential avenue for the reasonable design of low-cost and highly efficient catalysts for advanced metal-CO 2 batteries systems.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Penghui Ding,Jun Di,Xiaoliu Chen,Mengxia Ji,Kaizhi Gu,Sheng Yin,Gaopeng Liu,Fei Zhang,Jiexiang Xia,Huaming Li
In this study, S, N codoped graphene quantum dots/(BiO)2CO3 hollow microspheres have been fabricated by a facile electrostatic self-assembly method. The nanosized S, N:GQDs, which can be obtained by a bottom-up approach, are superior surface modification materials for photocatalytic applications due to their better electron transfer and peroxidase mimetic properties. The excellent oxidation property of the synthesized nanocomposite is confirmed by degradation of different model pollutants, such as rhodamine B, tetracycline, and bisphenol A under light irradiation or dark situation. Based on several experiments, the essential roles of S, N:GQDs can be described as (i) a photocarrier transport center strengthening photoinduced charge carriers (h+–e–) separation and (ii) an enzymatic-like catalysis center to accelerate H2O2 decomposition to produce ·OH because the surface accumulation of H2O2 is harmful for photocatalytic processes. The present work may pave the way for integrating enzymatic-like cocatalysis into a photocatalytic process to generate more reactive oxygen species, thus advancing the field of environmental remediation and synthetic chemistry.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Dongdong Chu,Haoran Dong,Yangju Li,Junyang Xiao,Xiuzhen Hou,Shuxue Xiang,Qixia Dong
In this work, sulfur/nitrogen modified reduced graphene oxide (S/N-rGO) was employed as both electron shuttle and support to fabricate Fe-Mn bimetallic organic framework@S/N-rGO hybrids (BOF@S/N-rGO) via a facile two-step solvothermal route. Compared with the transition metal ions (Fe 2+ /Mn 2+ ), the classical metal oxide catalyst (Fe 2 O 3 and Fe 3 O 4 ) and nano zero-valent iron (nZVI), BOF@S/N-rGO catalyst can more effectively activate peroxydisulfate (PDS) with ultra-low concentration (0.05 mM) to degrade sulfamethazine (SMT). Quenching experiments, electron paramagnetic resonance (EPR) measurement and linear sweep voltammetry (LSV) showed that the activation pathways of PDS between the two catalysts were different. In BOF@N-rGO+PDS system, the degradation of SMT was mainly attributed to the oxidation of radicals including SO 4 •− and •OH, especially SO 4 •− . However, in BOF@S-rGO+PDS system, in addition to the radical pathway, there are also non-radical pathways, namely 1 O 2 and direct electron transfer . Furthermore, the applicability of BOF@S/N-rGO used in the PDS-mediated advanced oxidation processes (AOPs) was systematically investigated in terms of the effects of operating parameters and coexisting substance (anions and humic acid (HA)), the degradation of other pollutants, as well as the stability and reusability of the catalyst. This study proved that BOF@S/N-rGO was a promising activator of PDS with ultra-low concentration for the degradation of SMT.
研究领域:
环境科学
·
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）