MATERIALS CHEMISTRY AND PHYSICS
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2021
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IF 4.094
Xianhao Min,Qifei Xie,Zhiguo Wang,Xinzhong Wang,Mingxiang Chen
As traditional capping ligands like oleic acid (OA) and oleylamine (OLA) cannot efficiently maintain the optoelectronic properties and stability of iodide perovskite nanocrystals (NCs), post synthesis surface modification with some other ligand is a convenient and valid method to solve these problems to some extent. Here we promote a long carbon chain ligand with a thiol group, 1-Octadecanethiol (ODT), to realize the passivation of the surface of CsPbI 3 NCs after the synthesis process. After modification, our ODT-CsPbI 3 NCs exhibit excellent optical properties with a high PLQY of 93% and outstanding stability under different conditions compared to the untreated samples.
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Nature Communications
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2021
·Vol. 12
·期 1
·1-8
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IF 14.919
Zhan Changhong,Xu Yong,Bu Lingzheng,Zhu Huaze,Feng Yonggang,Yang Tang,Zhang Ying,Yang Zhiqing,Huang Bolong,Shao Qi,Huang Xiaoqing
High-entropy alloys (HEAs) with unique physicochemical properties have attracted tremendous attention in many fields, yet the precise control on dimension and morphology at atomic level remains formidable challenges. Herein, we synthesize unique PtRuNiCoFeMo HEA subnanometer nanowires (SNWs) for alkaline hydrogen oxidation reaction (HOR). The mass and specific activities of HEA SNWs/C reach 6.75 A mg Pt+Ru −1 and 8.96 mA cm −2 , respectively, which are 2.8/2.6, 4.1/2.4, and 19.8/18.7 times higher than those of HEA NPs/C, commercial PtRu/C and Pt/C, respectively. It can even display enhanced resistance to CO poisoning during HOR in the presence of 1000 ppm CO. Density functional theory calculations reveal that the strong interactions between different metal sites in HEA SNWs can greatly regulate the binding strength of proton and hydroxyl, and therefore enhances the HOR activity. This work not only provides a viable synthetic route for the fabrication of Pt-based HEA subnano/nano materials, but also promotes the fundamental researches on catalysis and beyond.
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CHEMISTRY OF MATERIALS
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2021
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IF 9.811
Chao Pang,Shiben Hu,Chan Guo,Jiantai Wang,Shenghan Zou,Zhangxu Pan,Jiucheng Liu,Liming Shen,Ningzhong Bao,Honglong Ning,Arunava Gupta,Zheng Gong
Nanocrystal (NC) CuInSe2 thin-film transistors (TFTs), consisting of nontoxic and relatively abundant elements, have great potential in environment-friendly and low-cost electronic devices. However, the high-performance CuInSe2 NC TFTs reported so far utilize toxic compounds, such as CdSe and hydrazine, which often require tedious and complex procedures. TFTs using directly synthesized CuInSe2 NCs as channel layers exhibit promising device performances but are still not comparable to the counterparts of cadmium and lead chalcogenide-based NCs. In this work, an efficient solution-based colloidal synthesis and ligand-exchange process have been developed to effectively remove bulky surfactant ligands from CuInSe2 NCs and produce unique inorganically connected NCs through metal-sulfide bonding using simple metal-free chalcogenide compounds. Such inorganically connected CuInSe2 NC thin films, combined with surface treatment, substantially affect charge transport through trap states and tunneling transport mechanism. The carriers tunneling through the barrier between neighboring NCs with much shorter interparticle distances significantly enhance electronic coupling and improve the electrical transport properties. CuInSe2 NC TFT exhibits the electrical performance with a mobility of 9.6 cm2/(V s), on/off current ratio over 104, and negligible hysteresis at low operating voltages, comparable to those for state-of-the-art II–VI- and IV–VI-type NC TFTs. As a proof of concept, the CuInSe2 NC TFTs are used as building blocks of integrated inverters to demonstrate their promise for low process temperature-fabricated NC circuits.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Hongbin Shi,Xiaofeng Dai,Qing Liu,Teng Zhang,Yabing Zhang,Yuling Shi,Tao Wang
Magnetic CuNi alloy nanoparticles (CuNi NPs) for the catalytic transfer hydrogenation (CTH) of nitroarene were successfully prepared by the facile thermal decomposition of copper formate (Cuf) and nickel formate (Nif) simultaneously. Liquid paraffin served as solvent, and oleylamine (OAM) acted as both complexing agent and stabilizer. The particle size and Cu/Ni composition of CuNi NPs could be controlled by adjusting the amount of OAM and the Cu/Ni ratio of the precursor. The average diameter of the prepared CuNi NPs ranged from 10.2 to 56.9 nm. It had been confirmed that CuNi NPs were an alloy of Cu and Ni and effectively resistant to oxidation. The prepared CuNi NPs could be separated under an external magnetic field without any energy consumption since they were superparamagnetic. Among the prepared CuNi NPs with different compositions, the Cu3Ni7 NPs were the best catalyst for catalytic transfer hydrogenation of nitrobenzene with ethylene glycol (EG) as the hydrogen donor, giving a nitrobenzene conversion of 99% and an aniline yield of >97%. The conversion and yield remained above 95% and 80% respectively after 10 cycles of NOBF4-treated Cu3Ni7 NPs, demonstrating good reusability for the CTH reaction. This work reported a novel method for preparing magnetic CuNi NPs and also provided a new approach for the hydrogenation of nitroarene catalyzed by non-noble metals in a green environment.
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Small
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2023
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IF 13.3
Rui Gao,Wanqing Xu,Zhiqing Wang,Fen Li,Yueli Liu,Guogang Li,Keqiang Chen
Synthesis of upconversion nanoparticles (UCNPs)-metal halide perovskites (MHPs) heterostructure is garnered immense attentions due to their unparalleled photophysical properties. However, the obvious difference in their structural forms makes it a huge challenge. Herein, hexagonal β-NaYF 4 and hexagonal Cs 4 PbBr 6 are filtrated to construct the UCNP/MHP heterostructural luminescent material. The similarity in their crystal structures facilitate the heteroepitaxial growth of Cs 4 PbBr 6 on the surface of β-NaYF 4 NPs, leading to the formation of high-quality β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell nanocrystals (NCs). Interestingly, this heterostructure endows the core/shell NCs with typically narrow-band green emission centered at 524 nm under 980 nm excitation, which should be attributed to the Förster resonance energy transfer (FRET) from Tm 3+ to Cs 4 PbBr 6 . It is noteworthy that the FRET efficiency of β-NaYF 4 :Yb,Tm/Cs 4 PbBr 6 core/shell NCs (58.33%) is much higher than that of the physically mixed sample (1.84%). In addition, the reduced defect density, lattice anchoring effect, as well as diluted ionic bonding proportion induced by the core/shell structure further increase the excellent water-resistance and thermal cycling stability of Cs 4 PbBr 6 . These findings open up a new way to construct UCNP/MHP heterostructure with better multi-code luminescence performance and stability and promote its wide optoelectronic applications.
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CHINESE CHEMICAL LETTERS
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2023
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IF 9.1
Juanjuan Wang,Fang Wang,Bin Qin,Yue Wu,Huan Yang,Xiaolong Li,Lanfang Wang,Xiufang Qin,Xiaohong Xu
ABSTRACT 3d transition metal chalcogenides have attracted much attention due to their unique magnetic properties. Although various Cr, V, and Fe-based chalcogenides have been fabricated recently, the limited Curie temperature ( T C ) still hinders their practical application. Based on the structural and magnetic advantages of MFe 2 O 4 and Fe 3 Se 4 , we developed a one-pot solution synthesis method for the fabrication of NiFe 2 Se 4 nanostructures with structural continuity, to facilitate the investigation of their magnetic properties. Notably, the morphology of NiFe 2 Se 4 can be controlled from nano-rods to nano-platelets by controlling the growth direction. The coercivity ( H C ) of NiFe 2 Se 4 with nano-cactus structure exhibits a maximum of 12.77 kOe at 5 K. The coercivity of ferrimagnetic NiFe 2 Se 4 nano-platelets can be further adjusted to 1.52 kOe at room temperature. These results show that the magnetic properties of NiFe 2 Se 4 can be significantly modified by controlling their morphologies. We also extend the method to the synthesis of CoFe 2 Se 4 nano-cactus with an ultrahigh coercivity of 17.85 kOe at 5 K. Obviously, the synthesis strategy and their excellent magnetic properties of MFe 2 Se 4 have sparked interest in ternary transition metal selenides as potential hard magnetic materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yuling Shi,Qing Liu,Qianqian Pan,Danlong Yang,Tao Wang
Polymer@metal core-shell microspheres are widely used in anisotropic conductive adhesives (ACAs). Styrene-divinylbenzene copolymer (PS-DVB) copper core-shell microspheres (PS-DVB@Cu) with high conductivity and anti-oxidation performance were successfully prepared by combining copper nanoparticles (Cu NPs) and electroless plating copper. The Cu NPs served as catalytic seeds, substituting noble metals to promote electroless deposition . Using environmentally benign ammonia borane as the reductant to replace toxic formaldehyde, the dense copper film was deposited on the surface of PS-DVB microspheres. The thickness of the Cu layer and bulk electrical resistivity of PS-DVB@Cu were tuned by controlling the concentration of the reducing agent. The minimum resistivity of PS-DVB@Cu was 3.27 × 10 −6 Ω·m and merely slightly changed in the air for two months. The prepared PS-DVB@Cu-based ACAs could be effectively applied to anisotropic conductive connections in small-scale circuits with satisfactory anisotropic conductivity.
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TRIBOLOGY INTERNATIONAL
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2023
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IF 6.2
Qiang Tang,Qing-Yun Wu,Lin Gu
Graphene oxide (GO) nanocomposite lubricants have been verified with excellent anti−wear and anti−friction properties. However, the rapid transfer of hydrophilic GO nanosheets into hydrophobic lubricants still faces great challenges. In this work, a series of nanocomposite lubricants were successfully fabricated by a simple phase transfer process without complex chemical modification. With the assistance of ethanol and oleylamine, the GO nanosheets initially dispersed in the water phase could be quickly transferred to the mineral oil within 20 s after hand-shaking the immiscible two−phase system. Moreover, the phase−transferred GO nanosheets were greatly stable in the mineral oil for at least seven days. The tribological properties of the GO nanocomposite lubricants had been studied by a macroscopic ball−on−disk friction test. The tribological behavior of the obtained nanocomposite lubricants showed that when 0.1 mg/mL GO was dispersed into mineral oil, the minimum average friction coefficient was 0.140, which was 72% lower than that of mineral oil. The universality of the phase transfer process was verified by the reduced GO nanosheets. This physical phase transfer method must be simple, effective, and environment−friendly to prepare nanocomposite lubricants.
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SENSORS AND ACTUATORS B-CHEMICAL
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2023
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IF 8.4
Yating Zhang,Xiaoyu Zheng,Siqi Chen,Yongzhen Qiu,Fang Luo,Zuquan Weng,Bin Qiu,Jian Shou,Zhenyu Lin
Lead halide perovskites have garnered significant attention in the field of photoelectrochemistry due to their outstanding optical properties . Nevertheless, the pronounced susceptibility of perovskite to water poses a major limitation to its practical applications. A signal-on photoelectrochemical (PEC) sensor was constructed in this work using water-resistant perovskite nanocrystals for the detection of hydrogen sulfide . Specially, the electrode surface was modified with composite nanomaterials (CsPbBr 3 @PEG-PCL). In the presence of H 2 S, efficient heterojunctions were formed through the in-situ generation of PbS on CsPbBr 3 @PEG-PCL, thereby enhancing the photocurrent signal. The potential mechanism behind this signal enhancement was extensively discussed. The designed sensor exhibited a linear relationship with the concentration of H 2 S ranging from 0.02 to 120 μM, with a detection limit of 6.67 nM. This work opens up new possibilities for utilizing halide perovskites in the field of sensing, with promising applications in areas such as food safety, environmental monitoring, and biomedical analysis.
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JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Changbo Deng,Tingxin Fu,Qiuping Huang,Zhengping Fu,Yalin Lu
The poor stability and low photoluminescence quantum yield (PLQY) of halide perovskite quantum dots (QDs) have been major challenges for their future practical application. Ligand engineering has been demonstrated as an effective approach for enhancing both stability and PLQY. Herein, we introduce a zwitterionic ligand, specifically N -tetradecyl- N,N -dimethyl-3-ammonio-1-propanesulfonate (TDPS), to synthesize stable CsPbBr 3 QDs by ligand post-treatment. The as-prepared TDPS-QDs exhibited an exceptional PLQY of 86.5 % and superior colloidal stability when exposed to UV light , heat, and polar solvents , owing to surface defect passivation and strong affinity to the surfaces. The PL intensity of TDPS-QDs maintains approximately 68 % (120 min) and 103 % (48 h) of its initial emission intensity under continuous irradiation or heat, respectively, whereas OA-QDs (pristine CsPbBr 3 QDs) undergo greater quenching within a shorter period. The findings highlight the potential for TDPS ligand modification to simultaneously improve the QY and stability, thus opening novel avenues for future applications involving CsPbBr 3 QDs .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Shuai Ma,Lifeng Dong,Hongzhou Dong,Jie Wang,Yingjie Chen,Beili Pang,Jianguang Feng,Liyan Yu,Mei Zhao
We concretely report feasible synthesis procedures of colloidal Cu 2 ZnSn(S 1- x ,Se x ) 4 -Au (CZTSSe-Au) nano-heterostructured composites, and creatively employ them as the counter electrodes (CEs) of all-solid-state solar cells with inorganic CsSnI 2.95 F 0.05 perovskite hole conductor. Acquired optical characterization indicates that integration of noble metal nanoparticles with cuprum-chalcogenide could heighten light absorption within visible-band due to localized surface plasmon resonance (LSPR) generated by Au, and the forbidden gap of nanocomposites gets adjustment accordingly. It is demonstrated that this novel photocathode alternative with favorable conductivity can not only match the energy level within the device band structure construction, but also restrain recombination so that accelerate charge transfer and extraction occurring on the photocathode. The photocurrent and photoelectric conversion efficiency (PCE) of cells conjugating CZTS-Au photocathodes turn to be respectively 43% and 25% higher than those using pure CZTS. Moreover, it has been demonstrated that CZTS-Au, coupling very well with inorganic perovskite, owns comparable electrocatalytic performance and even higher output photocurrent with respect to platinum CEs, which portends a potential substitution for conventional costly photocathodes. A comprehensive analysis on impedance spectroscopy data is subsequently carried out for the sake of deep understanding charge accumulation and transfer response at CsSnI 2.95 F 0.05 /CE interface, attempting to orient further optimization of device performance.
研究领域:
材料科学
·
能源科学
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CHEMISTRY-A EUROPEAN JOURNAL
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2020
·Vol. 26
·期 35
·7955-7960
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IF 4.857
Bingquan Jia,Du Sun,Wei Zhao,Fangfang Xu,Fuqiang Huang
Graphical Ball control : A new synthetic method based on CdNCN nanoparticle anion exchange reactions was developed to access solid or hollow CdSe nanocrystals with tunable size, which exhibit narrow width of photoluminescence features. The obtained CdNCN@CdS heterostructures with modulated shell/core thickness show a remarkable improvement in photocatalysis compared to CdS or CdNCN NPs of similar size. Semiconductor nanocrystals of tunable shell/core configurations have great potential in photo-driven applications such as photoluminescence and photocatalysis, but few strategies realize a controllable synthesis with respect to both the size of the core and the shell with high crystallinity. Here, a new synthetic method based on cadmium cyanamide (CdNCN) nanoparticle anion exchange reactions was developed to access solid or hollow CdSe nanocrystals with tunable size and CdNCN@CdS heterostructures with modulated shell/core thickness. The gradual shift and narrow width of photoluminescence features demonstrate the high crystallinity and monodispersity of the resulting CdSe nanocrystals. In the CdNCN@CdS heterostructures, synergistic effects of the photocarrier separation is observed between the CdS shell and CdNCN core, which leads to great improvement in photocatalysis with optimized shell/core ratio.
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