ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shixiong Mei,Weili An,Jijiang Fu,Weiyuan Guo,Xiaoyu Feng,Xingxing Li,Biao Gao,Xuming Zhang,Kaifu Huo,Paul K. Chu
Although layered tin sulfide (SnS) nano-architectures are drawing much attention as anode materials in lithium ion batteries (LIBs) because of the high theoretical capacity, there are drawbacks such as the large volume expansion and low conductivity. To overcome these difficulties, attempts have been made to prepare tin sulfide/carbon (SnS/C) nano-hybrids by anchoring/coating nanostructured SnS on/in nano-sized carbon. However, the commonly reported SnS/C composites still suffer from initial Coulombic efficiency (ICE), high electrode swelling, and inferior long-term stability because of weak chemical affinity , and limited contacting interface between SnS and carbon specially at high SnS mass percentage. Herein, we report hierarchical micro-flowers self-assembled from SnS monolayers and nitrogen-doped graphene (NG) lamellar nanosheets (NG-SnS) which are suitable for LIBs anode. The NG-SnS with a high SnS mass percentage (93.9 wt%), obvious C–S bond, and increased contact provide to boost activity, utilization, conductivity, and reversibility of Li storage. Moreover, the elastic NG layers work as a mechanical supporter to decrease the outer volumetric expansion and restrain electrochemical agglomeration of SnS during (de)lithiation processes. The molecular engineered NG-SnS hybrid shows a high initial Coulombic efficiency of 88.2%, robust cycle stability with a high capacity of 790 mAh g −1 after 900 cycles at 0.5 C, considerable rate performance, and small electrode swelling of 12%.
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Journal of Cleaner Production
·
2019
·
IF 6.395
Xiaoxiao Qian,Zhi Chen,Xiuru Yang,Wan Zhao,Chunxi Liu,Tao Sun,Dantong Zhou,Qian Yang,Guoying Wei,Meiqiang Fan
The efficient removal of antibiotic residues has drawn wide interests; however, little attention has been focused on treating them in organic system. Inorganic perovskite cesium lead bromide quantum dots were successfully prepared by anti-solvent precipitation and the prepared cesium lead bromide quantum dots were well-characterized. The photocatalytic activity was evaluated by degradation of tetracycline hydrochloride in ethanol as a model reactant under visible light for the first time. 76% tetracycline hydrochloride and 70% methyl orange were efficiently degraded in 30 min, which illustrate cesium lead bromide quantum dots could work as efficient photocatalyst for the degradation of organic pollutants in ethanol. The photoelectric conversion efficiency and photoluminescence quantum yields were measured and calculated. The photodegradation process was systematically analyzed by full-wavelength absorption. It is found that superoxide radicals may play a major role in the photocatalytic degradation process by capture experiments and the reaction mechanism has been proposed. Cesium lead bromide is not stable in water and may be converted into perovskite-related phase with water, which will result in the loss of photocatalytic activity. This work indicates that cesium lead bromide may act as an efficient photocatalyst for the removal of tetracycline hydrochloride and methyl orange in organic system, which may benefit the development/application of novel photocatalysts for special applications.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zhaoyan Yang,Jingkun Xu,Shenfei Zong,Shuhong Xu,Dan Zhu,Yizhi Zhang,Chen Chen,Chunlei Wang,Zhuyuan Wang,Yiping Cui
Lead halide perovskite nanocrystals (NCs) are promising optical materials in many fields. However, their poor moisture stability, significant toxicity, and difficulty to be further functionalized greatly hinder their applications in bioimaging. Here, a universal strategy is demonstrated by simply encapsulating CsPbX3 (X = Cl, Br, I) NCs into phospholipids to achieve CsPbX3–phospholipid micelles (CsPbX3@phospholipid) as probes for multiplex encoding cellular imaging or tumor-targeted imaging. The layer of phospholipids endows CsPbX3 NCs with superior water-resistant characteristics, the ability to be further biofunctionalized, and greatly improved biocompatibility. The CsPbX3@phospholipid micelles exhibited strong luminescence with narrow fwhm in water for more than four months. Specifically, even after being modified with folic acid, the bright fluorescence of the micelles was well retained, which were employed for the targeting of Hela cells. Finally, the greatly reduced toxicity of the CsPbX3@phospholipid micelles was verified using HeLa cells and zebrafish as in vitro and in vivo models, respectively.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yi Ren,Kaibin Tang,Wenqi Zhan,JingJing Luo,Miao Wang
As a typical noble nanomaterial , silver (Ag) nanoparticles have been widely used as a catalyst, but their performance is somewhat limited by self-aggregation. In this study, H 2 SrTa 2 O 7 nanosheet-supported ultrafine Ag nanoparticles (Ag/H 2 SrTa 2 O 7 ) were successfully synthesized, and the aggregation of Ag nanoparticles was effectively prevented. The Ag/H 2 SrTa 2 O 7 catalyst exhibited excellent activity in p -nitrophenol reduction and was successfully recycled 10 times without a substantial decrease in its catalytic activity. This superior catalytic activity could be ascribed to the large surface area of H 2 SrTa 2 O 7 nanosheets and the effective dispersion of Ag nanoparticles on the perovskite nanosheets. This work is important for the simple and green preparation of Ag catalysts with excellent catalytic performance on nontoxic perovskite nanosheets.
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ACS Applied Electronic Materials
·
2019
·
IF 0
Guangyou Liu,Chuntian Qiu,Bingbing Tian,Xiangning Pan,Dong Ding,Yu Chen,Can Ren,Tingchao He,Yumeng Shi,Chenliang Su,Ying Li,Yanxia Gao,Dianyuan Fan
Two-dimensional (2D) organic–inorganic hybrid perovskites (OIHPs) have recently drawn great interest due to their easy synthesis and excellent photoelectric properties. With tunable bandgaps, 2D OIHPs have been widely investigated for use in optoelectronic sensors, photodetectors, and solar cells. In this work, we synthesized three types of 2D perovskites with different organic chains, (CH3(CH2)3NH3)2PbI4 (C4, (BA)2PbI4), (CH3(CH2)5NH3)2PbI4 (C6, (HA)2PbI4), and (CH3(CH2)7NH3)2PbI4 (C8, (OA)2PbI4), and investigated their photoelectric properties. With increasing organic chain length, the interlayer spacing, bandgaps, and stability in air increased correspondingly. In addition, tunable optoelectronic properties were achieved when these three perovskites with different organic chain cations were employed to fabricate photodetectors. The results provide an effective method for synthesizing various OIHPs via tuning different organic cations and are helpful to broaden the applications of OIHPs in photoelectric devices.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Xiangfei Geng,Yang Yang,Zhiming Wu,Cong Zhang,Bin Ding,Weidong Liu,Qun Zhang,Baoshan Guan
Alkane-modified molybdenum disulfide (AM-MoS 2 ) nanosheets have attracted widespread interest as oil displacement agents for enhancing oil recovery due to their unique oil-water interfacial properties . However, the relationship between the interfacial activity and alkyl chain structure of AM-MoS 2 is not comprehensively understood. In this study, 3AM-MoS 2 nanosheets were prepared with MoS 2 and alkylamines to study the effect of alkyl chain length on the oil-water interfacial activity of AM-MoS 2 nanosheets under different salinity conditions. The AM-MoS 2 nanosheets prepared with octylamine, dodecylamine, and octadecylamine were referred to as AM 8 -MoS 2 , AM 12 -MoS 2 , and AM 18 -MoS 2 , respectively. AM 18 -MoS 2 , which possesses the longest alkyl chain among all the samples, exhibited the highest oil-water interface adsorption ratio within the experimental concentration and salinity ranges. However, the changes in oil-water interfacial tension (IFT) did not agree with the changes in the interface adsorption ratio of nanosheets. AM 18 -MoS 2 exhibited the best interfacial activity, and the IFT was lower than that of MoS 2 , AM 8 -MoS 2 and AM 12 -MoS 2 when the salinity was no more than 5000 mg/L, while AM 12 -MoS 2 and AM 8 -MoS 2 exhibited the best interfacial activity and the lowest IFT when the salinity reached 10,000 mg/L and 20,000 mg/L, respectively. Considering that the interface adsorption ratio of AM 18 -MoS 2 was higher than that of the other samples under all the experimental conditions, the change in IFT and interfacial activity could be attributed to the change in the morphology of the adsorption layer of nanosheets. The decreased charge repulsion and the increased hydrodynamic size of nanosheets, which resulted from increased salinity, had positive and negative effects, respectively, on the morphology of the adsorption layer. The competition between the two effects resulted in the inflection point in the relationship between the IFT and salinity of AM-MoS 2 . The AM-MoS 2 nanosheets with the optimum alkyl chain length balanced the dispersity and hydrophobicity , which contributed to achieving the best interfacial activity at a certain salinity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 30
·1-10
·
IF 2.8
Ren Ying,Zhou Heng,Huang Wentao,Li Hongyu,Li Zhengxin
Rapid industrialization has brought about Cr 6+ pollution, and the excellent performance of carbon dots (CDs) provides a new idea for preparing environmentally friendly nanoprobes for Cr 6+ detection. In the present work, five spherical fluorescent CDs with an average diameter of 4 nm based on citric acid, citric acid and p-phenylenediamine, citric acid and octylamine, gelatin, and glutamic acid were synthesized by a one-step hydrothermal process. Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–Vis) absorption spectra and steady-state fluorescence spectroscopy were used to detect the fluorescence properties of CDs. A fluorescent “on–off” sensor was used to investigate the effects on Cr 6+ by using the fluorescence burst mechanism of CDs. The results indicate that Cr 6+ had a fluorescence burst effect assigned to CDs its chelation with the Cr(VI) on all the four CDs containing elemental nitrogen which facilitating charge transfer from the excited state of the CDs to Cr(VI). Among the other four CDs used for Cr(VI) detection, the gelatin-based CDs had a wide detection range and good linearity ( R 2 = 0.9873) for Cr(VI). There is a linear relationship between the degree of fluorescence burst and the Cr 6+ concentration, which provides a reference for the use of CDs in metal ion detection.
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JOURNAL OF SUPERCRITICAL FLUIDS
·
2023
·
IF 3.9
Yulan Qian,Ye Yuan,Junyang Zhu,Jinglong Li,Chengqi Jiao,Xiaoqing Xiong
In this study, three N ,4-dialkyl-substituted 1,8-naphthalimide fluorescent dyes (NPBA, NPHA, and NPOA) were synthesized in supercritical carbon dioxide (scCO 2 ) by reacting 4-bromo-1,8-naphthalic anhydride with three amines ( n -butylamine, n -hexylamine, and n -octylamine). The optimal reaction conditions and highest yields of these dyes were obtained. The yield of NPHA was 92% ± 0.57% using an organic solvent-free synthetic method. The results also indicate that the reaction time was gradually shortened by elongating the alkyl chain in the amines, and the required reaction pressure was 12 MPa or lower. Additionally, the dyeing of polyester fabrics with these three dyes was investigated using scCO 2 . The optimal dyeing time and temperature for NPBA were 70 min and 150 ℃, but they decreased at 10 gradients with the addition of two carbon atoms to the alkyl chain in the amines. The optimal dyeing pressure increased from 20 MPa to 24 MPa.
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Materials Today Chemistry
·
2023
·
IF 7.3
Haijiang Qiu,Jianing Wu,Min Li,Zhenyu Hu,Song Yang,Yanyan Li,Yingying Gu,Hongrui Cheng,Yuanhui Zheng
Gallium nitride quantum dots (GaN QDs), as a third-generation semiconductor material, are usually synthesized through a vapor deposition method at an elevated temperature (typically ≥800 °C). Thermal injection method is rarely reported for the synthesis of GaN QDs due to the lack of active precursors and the require of harsh reaction conditions. Here, we report the fabrication of oxygen doped colloidal GaN QDs via rapid thermal injection. By screening the reaction temperature and solvent, well-dispersed GaN QDs with a size of 3.8 nm were obtained in octadecylamine (ODA) at 360 °C. The synthesized GaN QDs show blue emission, the maximum emission wavelength is about 440 nm, and the photoluminescence quantum yield is 14.3%. Furthermore, we reveal the donor-acceptor mechanism of blue emission from GaN QDs. During the growth of GaN QDs, oxygen atoms occupy some nitrogen sites and produce a shallow oxygen donor energy level (O N ). A part of the O N can be combined with the adjacent gallium vacancy (V Ga ) to form a V Ga -O N acceptor, whose energy level is about 0.98 eV above the valence band of GaN QDs. The transition of excited electrons from the donor (O N ) to the acceptor (V Ga -O N ) is responsible for the blue emission of GaN QDs.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Chenrui Liu,Yun Liu,Wentao Shen,Shuangyi Lin,Hao He,Fan Li,Feng Li,Jiang Tian
The environmental migration and bioavailability of Hexavalent chromium (Cr(VI)) could be affected by facet-dependent pyrite (FeS 2 ) existing in soils and sediments. Conversely, the occurrence state of facet-dependent FeS 2 might also be influenced by Cr(VI). However, the complex interactive mechanism at the solid–liquid interface between facet-dependent FeS 2 and Cr(VI) still remained ambiguous. Herein, FeS 2 nanobelts, FeS 2 nanosheets, and FeS 2 nanocubes with corresponding dominant facets of ( −1 1 0), (0 0 1), (1 0 0)/(2 1 0) were prepared. The adsorption and reduction experimental results reflected that Cr(VI) species were predominantly adsorbed and a portion of them was reduced to Cr(III) at the FeS 2 interfaces. In particular, the adsorption efficiency of Cr(VI) on (0 0 1) facet was 1.39 and 4.69 times than those on ( −1 1 0) and (1 0 0)+(2 1 0) facets, respectively. The results of in situ Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) measurements and Density Functional Theory (DFT) calculations suggested that bidentate binuclear (BB) coordinated chromates were generated on the (0 0 1) facet while monodentate mononuclear (MM) coordinated chromates were formed on ( −1 1 0), (1 0 0), and (2 1 0) facets. Due to the stronger adsorption energy and more stable coordination mode of BB for Cr(VI) species on (0 0 1) facet, FeS 2 NS exhibited higher efficiency of Cr(VI) removal and reduction compared with FeS 2 NB and FeS 2 NC. In addition, partial FeS 2 particles were proved to be transformed to goethite under the effect of Cr(VI). Owing to the stronger adsorption of Cr(VI) species on (0 0 1) facet, FeS 2 NS also had a faster phase transformation rate than FeS 2 NB and FeS 2 NC. Above results all reflected the good structure–reactivity relationships between the FeS 2 facets and the Cr(VI) removal efficiency as well as the phase transformation of FeS 2 particles.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ya Wang,Huicheng Hu,Mohan Yuan,Hang Xia,Xingchen Zhang,Jing Liu,Ji Yang,Shaoqiu Xu,Zhaorong Shi,Jungang He,Jianbing Zhang,Liang Gao,Jiang Tang,Xinzheng Lan
Lead sulfide (PbS) colloidal quantum dots (CQDs) for photodetectors (PDs) have garnered great attention due to their potential use as low-cost, high-performance, and large-area infrared focal plane arrays. The prevailing device architecture employed for PbS CQD PDs is the p–i–n structure, where PbS CQD films treated with thiol molecules, such as 1,2-ethanedithiol (EDT), are widely used as p-type layers due to their favorable band alignment. However, PbS-EDT films face a critical challenge associated with low film quality, resulting in many defects that curtail the device performance. Herein, a controlled oxidization process is developed for better surface passivation of the PbS-EDT transport layer. The dark current density (Jd) of PbS CQD PDs based on optimized PbS-EDT layer shows a dramatic decrease by nearly 2 orders of magnitude. The increase of carrier lifetime and suppression of carrier recombination via controlled oxidation in PbS-EDT CQDs were confirmed by transient absorption spectra and electrochemical impedance spectra. The device based on the optimized PbS-EDT hole transport layer (HTL) exhibits a specific detectivity (D*) that is 3.4 times higher compared to the control device. Finally, the CQD PD employing oxidization PbS-EDT CQDs is integrated with a thin film transistor (TFT) readout circuit, which successfully accomplishes material discrimination imaging, material occlusion imaging, and smoke penetration imaging. The controlled oxidization strategy verifies the significance of surface management of CQD solids and is expected to help advance infrared optoelectronic applications based on CQDs.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Zhaowen Liu,Hongcai Wang,Yanan Bu,Ting Wu,Xiuqiong Chen,Huiqiong Yan,Qiang Lin
The application of hydrophobic β-carotene in the food industry are limited due to its susceptibility to light, high temperature, pH value, and other factors, leading to poor stability and low bioavailability. To address this problem, we adopt a more green and environmentally friendly reducing agent, 2-methylpyridine borane complex (pic-BH 3 ), instead of traditional sodium borohydride, to achieve the simple green and efficient synthesis of amphiphilic oxidized sodium alginate grafted oleoamine derivatives (OSAOLA) through the reduction amination reaction of Schiff base. The resultant OSAOLA with the degree of substitution (DS) of 7.2 %, 23.6 %, and 38.8 % were synthesized, and their CMC values ranged from 0.0095 to 0.062 mg/mL, indicating excellent self-assembly capability in aqueous solution. Meanwhile, OSAOLA showed no obvious cytotoxicity to RAW 264.7 cells, thus revealing good biocompatibility. Furthermore, β-carotene, as the hydrophobic active ingredients in foods was successfully encapsulated in the OSAOLA micelles by ultrasonic-dialysis method. The prepared drug-loaded OSAOLA micelles could maintain good stability when stored at room temperature for 7 d. Additionally, they were able to continuously release β-carotene and exert long-term effects in pH 7.4 PBS at 37 °C, effectively improving the bioavailability of β-carotene, which exhibited tremendous application potential in functional food and biomedical fields.
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高影响因子
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