CATALYSIS LETTERS
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2024
·Vol. 154
·期 11
·6157-6167
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IF 2.3
Yang Cuina,Wu Jun
The separation of photo-generated carriers in heterojunctions plays a crucial role in regulating the built-in electric field. The design of materials with directional migration characteristics inside the bulk phase and at the interface between the two phases is of great significance for studying photocatalytic hydrogen evolution. The P-CdS/Ag 2 S composite photocatalytic system prepared in this study was doped with P element by heating CdS and NaH 2 PO 2 in a muffle furnace, resulting in the directed migration of photo-generated charges in the prepared sample driven by an internal electric field. By in-situ deposition of Ag 2 S on the surface of P-CdS, a Janus heterojunction was prepared to enhance the transfer of charge carriers at the phase interface. The hydrogen evolution rate of P-CdS/Ag 2 S is 12.44 mmol·h −1 ·g −1 , which is 30 times higher than that of the previously prepared pure CdS sample (0.411 mmol·h −1 ·g −1 ). This significant improvement in photocatalytic performance is attributed to the doping of P element and the in-situ loading of Ag 2 S co-catalyst, which together promote the effective separation and transport of photogenerated charge carriers, thereby enhancing the photocatalytic activity of the material. This work is of great significance for exploring the charge-directed transfer problem of sulfide photocatalysts in the field of photocatalytic hydrogen evolution. Graphical
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Dan Zhao,Deying Liang,Huan Liu,Xincai Xiao
Hypoxanthine (Hx) and pH are important indicators for evaluating the freshness of aquatic products, and their rapid assessment can maximize public food safety and minimize economic losses. A nanozymes-loaded smart responsive hydrogel compound provides a new strategy for rapidly assessing the freshness of aquatic products. Accordingly, this paper reports the preparation of a hydrogel compound with pH responsiveness and peroxidase (POD) activity using a one-step method. In this method, sodium alginate, chitosan, and gelatin are used as the raw materials and Fe,Co,P-CDs (CDs) with POD activity as well as 3,3′,5,5′-tetramethylbenzidine and H 2 O 2 are simultaneously introduced as substrates. The hydrogel compound transforms from a solid to a sol based on its pH response (pH = 6.5–8.0), and its color changes from blue to colorless because of its Hx response to the inhibition of the POD activity of CDs. The color difference shows a good linear relationship with the Hx concentration in the range of 1.5–1500 μM, with a detection limit of 1.48 μM and an excellent recovery rate of practical samples. Based on the pH enhancement and Hx accumulation during the spoilage of shrimps, naked-eye and smartphone-assisted, real-time monitoring of the freshness of shrimp has been realized through the morphology and color changes of the hydrogel compound. This dual-response hydrogel compound provides a new strategy for monitoring the freshness of aquatic products with great potential in food safety monitoring.
研究领域:
食品安全
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生物化学
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材料科学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
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2026
·
IF 3.9
Ke Cheng,Tianyi Ma,Luoyilan Zhang,Hao Xue,Yin Yuan,Hong Zheng,Bin Liu
Coreopsis S/P-CDs from a CL sensor. • CL sensor detects Sudan III with 1.0 μM LOD. • Recoveries of 97.4% to 105.0% in real samples. A novel chemiluminescence sensor for Sudan III detection was developed using sulfur/phosphorus-doped carbon dots (S/P-CDs) synthesized from Coreopsis. Combined TEM, XPS, and FTIR analyses verified that the S/P-CDs exhibit uniform spherical morphology with well-resolved lattice fringes, successful S and P doping at atomic percentages of 3.6% and 1.7%, respectively, and abundant surface functionalities (including PO 4 3− and C O groups) that confer excellent water dispersibility and chemical reactivity. The S/P-CDs significantly enhanced the CL intensity of the acidic KMnO 4 -HCHO system. Under optimal conditions, the CL intensity was linearly correlated with the Sudan III concentration over the range of 5-100 μM, achieving a detection limit of 1.0 μM. The method was successfully applied to real samples, with recoveries of 97.4% to 105.0%, enabling rapid, convenient detection in food. Download: Download high-res image (366KB) Download: Download full-size image
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Tao Li,Zhiping Zhu,ShangMing Zhou,Huo Yang
2D nanofillers can effectively improve coatings' barrier and anti-corrosion properties but are less compatible with coatings and prone to agglomeration. In this paper, glucose-derived phosphorus-doped carbon dots (P-CDs) were prepared as dispersants, and functionalized α-zirconium phosphate (α-ZrP) was prepared by combining with α-ZrP through π-π interactions, which showed good dispersion and compatibility in waterborne epoxy (WEP). The corresponding modified WEP coating is prepared on Q235 substrates through the scrape coating method. The effect of fillers on the physical and chemical properties of the coating was studied by electrochemical impedance spectroscopy (EIS), neutral salt spray test, and immersion test. The results of the electrochemical test show that the |Z| 0.01 Hz value of the coating prepared by P-CDs@ZrP as the filler after soaking in 3.5 wt% NaCl solution for 30 d is three orders of magnitude higher than that of the WEP coating, and the corrosion resistance is greatly improved. The salt spray and soaking tests prove that the prepared P-CDs@ZrP coating has excellent barrier properties and corrosion resistance. Besides, P-CDs can also act as an effective passivation agent, which could adsorb on the surface of the Q235 substrate and form a passivation film, preventing further corrosion of the substrate. This study provides a new way to enhance the corrosion resistance of the coating.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Jiexiang Ren,Birong Zeng,Wei Lin,Xinyu Liu,Yiting Xu,Conghui Yuan,Lizong Dai
Three structurally distinct modifiers serving as pendant chains were incorporated into a DOPO-functionalized carbon dot (P-CDs)-cured epoxy vitrimer system, effectively regulating its network topology, intermolecular interactions, and transesterification behavior. • The BnVIm[Cl] pendant chain introduced synergistic cation-π and π-π intermolecular interactions, which significantly strengthened intermolecular forces and endowed the composite with excellent mechanical performances (tensile strength of 64.3 MPa, elongation at break of 15.6%, and toughness of 6.1 MJ/m 3 ). • The imidazole ring in the modifier promoted the carbonization of the EP/CDs/BnVIm[Cl] composite during combustion. The optimized composite achieved superior flame retardancy with a high LOI of 32.6% and UL-94 V-0 rating, accompanied by reduced pHRR, THR, and TSP values. • The EP/CDs/BnVIm[Cl]/CF carbon fiber composite exhibited efficient matrix degradation and outstanding recyclability of carbon fibers, realizing effective fiber recycling. Dynamic epoxy vitrimers feature outstanding reprocessability, self-healing performance, and recyclability. Nevertheless, the improved chain mobility derived from dynamic networks typically deteriorates their mechanical properties. Moreover, achieving high flame retardancy without compromising mechanical performance remains a formidable challenge. Herein, three structurally different pendant chains, namely BnVIm[Cl], VIm[Cl], and Bn, were incorporated into a DOPO-functionalized carbon dot (P-CDs)-cured epoxy vitrimer system to modulate its network topology, intermolecular interactions, and transesterification behavior. The results demonstrated that the EP/CDs/BnVIm[Cl]-7 composite delivered optimal comprehensive performance, with a tensile strength of 64.3 MPa, an elongation at break of 15.6%, and a toughness of 6.1 MJ/m 3 . Meanwhile, it exhibited superior flame retardancy, achieving a limiting oxygen index (LOI) of 32.6% and a UL-94 V-0 rating. The peak heat release rate (pHRR), total heat release (THR), and total smoke production (TSP) were reduced by 30.1%, 13.9%, and 18.9%, respectively. Furthermore, EP/CDs/BnVIm[Cl]-7 exhibited rapid stress relaxation, a crack-closure efficiency of 95.23%, a reprocessing efficiency of 93.39%, and effective solvent-mediated degradability, which enabled efficient resin removal and carbon fiber recovery. The structure-property relationship analysis indicates that the synergistic cation-π and π-π interactions introduced by BnVIm[Cl] strengthen intermolecular forces and increase the effective crosslinking density. Combined with the dynamic β-hydroxyl ester network, a favorable balance between network stability and chain mobility is realized, thereby simultaneously improving the mechanical properties, flame retardancy, and dynamic adaptability of the epoxy vitrimer. Download: Download high-res image (144KB) Download: Download full-size image
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Bingfang Shi,Yubin Su,Liangliang Zhang,Mengjiao Huang,Rongjun Liu,Shulin Zhao
Chemical doping with heteroatoms can effectively modulate physicochemical and photochemical properties of carbon dots (CDs). However, the development of multi heteroatoms codoped carbon nanodots is still in its early stage. In this work, a facile hydrothermal synthesis strategy was applied to synthesize multi heteroatoms (nitrogen and phosphorus) codoped carbon nanodots (N,P-CDs) using glucose as carbon source, and ammonia, phosphoric acid as dopant, respectively. Compared with CDs, the multi heteroatoms doped CDs resulted in dramatic improvement in the electronic characteristics and surface chemical activities. Therefore, the N,P-CDs prepared as described above exhibited a strong blue emission and a sensitive response to Fe3+. The N,P-CDs based fluorescent sensor was then applied to sensitively determine Fe3+ with a detection limit of 1.8 nM. Notably, the prepared N,P-CDs possessed negligible cytotoxicity, excellent biocompatibility, and high photostability. It was also applied for label-free detection of Fe3+ in complex biological samples and the fluorescence imaging of intracellular Fe3+, which indicated its potential applications in clinical diagnosis and other biologically related study.
研究领域:
分析化学
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材料科学
·
生物化学
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纳米技术
·
生物医学工程
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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）