ACS Applied Nano Materials
·
2023
·
IF 5.9
Haobing Zhao,Hailong Hu,Jinping Zheng,Yuan Qie,Kuibao Yu,Yangbin Zhu,Zhiqi Luo,Lihua Lin,Kaiyu Yang,Tailiang Guo,Fushan Li
With tunable emission in the full visible region, the ecofriendly InP quantum dots (QDs) show unique application prospects in light-emitting devices. At present, InP QDs suffer from wide-bandwidth emission, especially for electroluminescence (EL), which hinders their applications in high-performance display devices. Here, we report a facile one-pot synthesis of narrow-bandwidth InP/ZnSeS/ZnS QDs using a safe phosphorus source of tris(dimethylamino)phosphine, in which the ZnSeS inner-shell layer is formed via temperature-gradient solution growth from 240 to 280 °C. The synthesized green QDs have a high photoluminescence quantum yield (PLQY) of 91% and full width at half-maximum (fwhm) of 36 nm. Moreover, the resultant quantum dot light-emitting devices (QLEDs) also show a narrow fwhm of 42 nm, which is the narrowest emission of green InP QLEDs based on a safe phosphorus source reported so far. Further modulation of the electron injection into the device by inserting a thin layer of lithium fluoride results in a peak external quantum efficiency of 5.56%.
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CHEMICAL PAPERS
·
2023
·Vol. 77
·期 7
·3703-3712
·
IF 2.2
Zhou Zhiqiang,Cen Jianfang,Wang Huixiao,Sun Yu,Yang Liyun
Due to the high importance of transferrin in targeting tumor, the investigation on the functionalization process of quantum dots (QDs) using transferrin is very essential. In this paper, the interaction between CdSe and CdSe@ZnS QDs with transferrin was studied by various spectroscopies. It was found that the two types of QDs triggered the fluorescence quenching of transferrin by the static quenching mechanism. At 298 K, the binding constant for CdSe@ZnS QDs (8.03 × 10 6 L·mol −1 ) is higher than CdSe QDs (2.84 × 10 6 L·mol −1 ), implying that CdSe@ZnS QDs could bind stronger to transferrin. In addition, the values of enthalpy change (∆ H ), entropy change (∆ S ) and Gibbs free energy change (∆ G ) were negative, indicating that the binding procedures between both QDs and transferrin were spontaneous and the main binding forces were hydrogen bonding and van der Waals force. The results of CD spectra indicated that both QDs induced the conformational change of transferrin, which further caused the release of iron ions from transferrin. Compared with CdSe QDs, less contents of iron ions in transferrin were detected after interaction with CdSe@ZnS QDs. Additional cytotoxicity tests showed that both QDs were toxic to Hela and 293T cells, but the cytotoxicity of CdSe QDs was stronger than that of CdSe@ZnS QDs. Moreover, the combination of transferrin failed to promote the cytotoxicity of CdSe QDs and CdSe@ZnS QDs, which is ascribed to the release of iron ions during the interaction process between QDs and transferrin.
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OPTICAL MATERIALS
·
2023
·
IF 3.9
Qiaocan Huang,Zunxian Yang,Yuanqing Zhou,Yuliang Ye,Bingqing Ye,Zihong Shen,Wenbo Wu,Zongyi Meng,Zhiwei Zeng,Hongyi Hong,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Quantum dots (QDs) with an alloy shell (CdSe@ZnS/ZnS) are one of the most promising emitters for optoelectronic devices for their superior properties such as narrow full width at half maximum (FWHM), high color purity and tunable wavelength. However, the presence of lattice stresses during the internal growth of quantum dots can cause severe exciton bursts. Optimizing the ramp-up process during the core growth of quantum dots and rising the temperature when cladding with ZnS shells is an effective strategy for obtaining high-quality quantum dots. Besides, the stability of quantum dots is further modified by using 1-Octanethiol (OT) as ligands. Detailed analyses of the morphology, colloidal stability, and luminescence performance of QDs were represented. Finally, green CdSe@ZnS/ZnS QLEDs with prolonged carrier lifetimes and less defect state densities achieved peak luminescence at 361850 cd/m 2 with a current efficiency (CE) of 33 cd/A. This work provides a better understanding of the relationship between defect state density and the performance of quantum dots for designing and fabricating high-performance light-emitting diodes.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoyan Shi,Weiquan Liang,Guoping Liu,Bin Chen,Lianyi Shao,Yanxue Wu,Zhipeng Sun,Felipe García
The development of new energy-related materials is the pinnacle to attaining a sustainable society based on renewable energy. Over the past decades, plenty of electrode materials have been investigated seeking better energy storage properties. However, the often-tedious synthetic procedures and large amounts of solvents utilised during their syntheses incur high costs and severe environmental pollution. Here we present a solvent-free approach to metal–organic-frameworks/MXene-derived carbonaceous metal selenide/MXene composites with unique nanostructures rich in mesopores and macropores. These species can be readily transformed into high-performance electrode materials with enhanced Li/Na ion storage properties compared with their solution-based counterparts. Herein we report not only a unique metal–organic framework/MXene-derived electrode material displaying high-performance for advanced lithium/sodium storage applications but also its novel environmentally benign production process.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yun Xing,Shan Zhao,Jiaying Wu,Xin Tang,Yu Zhang,Zhirong Zou,Ke Huang,Xiaoli Xiong
Designing non-noble metal oxygen evolution catalysts with outstanding catalytic activity is crucial for realizing cost-effective water splitting. In this paper, nitrogen-doped carbon-encapsulated polyhedral yolk-shell nanostructure bimetallic selenide (ZnSe@CoSe 2 /N-C) electrocatalyst was successfully prepared by high-temperature selenization strategy using ZIF-8 @ZIF-67 as the framework. The specially designed nitrogen-doped core-shell structure has the advantages of high specific surface area and rough porous surface, which can expose more active sites and facilitate the transfer of electrons and ions on the electrode surface. The high conductivity of ZnSe, CoSe 2 nanoparticles and the synergistic effect of bimetal increase the electrochemical activity and electron mobility of the composite. ZnSe@CoSe 2 /N-C catalyst exhibits outstanding oxygen evolution reaction performance at 1.0 M KOH, which the overpotential is down to 170 mV at 10 mA cm −2 . Furthermore, ZnSe@CoSe 2 /N-C also shows well durability and long-term stability (>113 h). This experiment might open a new path for fabrication of low-cost non-noble metal selenide electrocatalysts for oxygen evolution.
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CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Ronghua Tan,Jing Ge,Congcong Wang,Ying Wan,Xiangliang Yang
A novel type of diselenide bond-bridged hydroxyethyl starch-doxorubicin conjugate, HES-SeSe-DOX, was synthesized via a specially designed multistep synthetic route. The optimally achieved HES-SeSe-DOX was further combined with photosensitizer, chlorin E6 (Ce6), to self-assemble into HES-SeSe-DOX/Ce6 nanoparticles (NPs) for potentiating chemo-photodynamic anti-tumor therapy via diselenide-triggered cascade actions. HES-SeSe-DOX/Ce6 NPs were observed to disintegrate through the cleavage or oxidation of diselenide-bridged linkages in response to the stimuli arising from glutathione (GSH), hydrogen peroxide and Ce6-induced singlet oxygen, respectively, as evidenced by the enlarged size with irregular shapes and cascade drug release. In vitro cell studies exhibited that HES-SeSe-DOX/Ce6 NPs in combination with laser irradiation effectively consumed intracellular GSH and promoted a large rise in levels of reactive oxygen species in tumor cells, actuating the disruption of intracellular redox balance and the enhanced chemo-photodynamic cytotoxicity against tumor cells. The in vivo investigations revealed that HES-SeSe-DOX/Ce6 NPs were inclined to accumulate in tumors with persistent fluorescence emission, inhibited tumor growth with high efficacy and had good safety. These findings demonstrate the potential of HES-SeSe-DOX/Ce6 NPs for use in chemo-photodynamic tumor therapy and suggest their viability for clinical translation.
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高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2023
·Vol. 40
·期 7
·2300010
·
IF 2.7
Qinghua Du,Hui Zhang,Jiapeng Zhang,Xinjian Xie,Guodong Liu,Guifeng Chen
Quantum dots have received great interest due to their excellent optoelectronic properties. However, the surface defects of quantum dots affect the carrier transport and ultimately reduce the photovoltaic efficiency. In this paper, a core–shell quantum dot by hot-injection method is prepared to grow a narrow-band semiconductor layer (CuInSe 2 (CISe) quantumdot) on the surface of a broad-band core material (cadmium sulfide (CdS) nanocrystal). The composition, structure, optical properties, and decay lifetime of CdS/CISe core–shells are investigated in more detail by X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL), UV–vis spectrophotometry, and fluorescence spectroscopy. The CdS/CISe core–shell structure has a broadened absorption range and still shows CISe-related quantum effects. The increased size of the core–shell and the smaller specific surface area of the CISe shell layer lead to a lower carrier complexation chance, which improves the carrier lifetime.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Pengtao Sheng,Youyang Xie,Shuyu Han,Yanling Li,Weili Li
Manganese ion-doped quantum dots (QDs) with wide band gaps have been widely investigated to modify their electronic, magnetic, and photophysical properties. The research on Mn-doped Cu-In-Se QDs with narrow band gaps has been minimal due to the profound differences in the reaction reactivity of cations. In this work, photoluminescent and magnetic Cu-In-Se QD nanoprobes were designed and synthesized by introducing Zn 2+ ions, which function as an intermediate acid that can regulate metal ion acidity to enhance the doping efficiency of Mn 2+ ions in a facile phosphine-free hot-injection protocol. The emission peaks of Zn-doped Cu-In-Se QDs and MnZn-doped Cu-In-Se QDs exhibit significant composition-dependent shifts. Moreover, incorporating manganese ions confers a paramagnetic character to MnZn-doped Cu-In-Se QDs and provides a quasi-core shell structure with an Mn-rich alloy shell layer, as demonstrated by the micro-structural surface analysis and electron paramagnetic resonance spectroscopy . Analyzing the decay lifetime and quantum yield reveals that this host-dopant coupling involves a preferential energy transfer from the host material to the dopant (Mn 2+ ions), wherein photogenerated electrons nonradiatively transfer to the 4 T 1 level of Mn dopant and then recombine with the Cu x state above the valance band of host QDs. The ability to serve as nanoprobes for the visualization of tumors through fluorescence and magnetic resonance dual-modality imaging makes these ternary MnZn-doped Cu-In-Se QDs strong candidates for practical applications in biology/biomedicine field.
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Journal of Energy Storage
·
2023
·
IF 9.4
Xiaolin Sun,Kai Zhao,Hucheng Fu,Hanwen Guo,Jun Shen,Fuhao Jin,Lei Wang,Zihao Wang,Liang Cui,Fengyu Quan,Jingquan Liu
For high-performance electrochemical energy storage and conversion applications, controllable nanoarchitecture arrays of the transition metal selenide on conductive substrates are attractive electrode materials. In this work, a heterostructure comprising of MnSe 2 nanorods over NiCo 2 Se 4 nanosheets with a large specific surface area is rationally generated on nickel foam (NF) substrate (MnSe 2 @NiCo 2 Se 4 ) using a hydrothermal process. The formation mechanism of the MnSe 2 @NiCo 2 Se 4 heterostructure was also examined by adjusting the selenium feeding during the selenization process. The MnSe 2 @NiCo 2 Se 4 -2 electrode exhibits remarkable capacitance (1078C g −1 at 1 A g −1 ), and superior cycle stability (90.7 % after 8000 cycles) as a result of the cooperative effect of MnSe 2 and NiCo 2 Se 4 . Furthermore, an asymmetric supercapacitor (ASC) was developed employing the improved MnSe 2 @NiCo 2 Se 4 -2 and activated carbon materials (AC) as the positive electrode and negative electrode (MnSe 2 @NiCo 2 Se 4 -2//AC), respectively, which has a high energy density of 63.2 Wh kg −1 at a power density of 396 W kg −1 . The impressive performance indicates that the MnSe 2 @NiCo 2 Se 4 electrode has a bright potential in supercapacitors .
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Zhu Kou,Jinhui Wang,Xingrui Tong,Pengyang Lei,Yi Gao,Siyu Zhang,Xinpan Cui,Sixin Wu,Guofa Cai
Electrochromic smart windows provide an important route to reduce building energy consumption by dynamically adjusting the transmission of visible and near-infrared light. However, the requirement for an external electrical supply greatly limits their application in energy-saving buildings. Herein, we develop a novel photovoltaic (PV) cell-powered electrochromic energy storage smart window prototype by the combination of nickel-cobalt bimetal oxide electrochromic window and Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cell, which not only realizes the function integration of self-power and intelligent solar radiation regulation, but also extends its function to energy storage. Specifically, the obtained NiCoO 2 electrochromic films display a large optical modulation (60.0% at 550 nm), fast switching time (7.6/11.4 s), outstanding stability and excellent rate capability. Based on the achieved NiCoO 2 film and TiO 2 film, high-performance electrochromic energy storage smart windows (EESW) were further assembled and demonstrated excellent compatibility with CZTSSe solar cell. Benefiting from the unique merits of CZTSSe cell, the self-powered EESW exhibits excellent optical modulation (56.0% at 550 nm) and fast coloration speed (17 s). Moreover, the self-powered EESW can serve as a power source to drive external electronics. Our exploration of multi-functional smart windows offers an effective strategy to realize a highly efficient low-energy building in the future.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Zeqing Hu,Rong Wei,Chen Yan,Han Wan,Yu Liu,Longjiu Cheng,Zhou Li,Jiming Song
In this work, carrier concentration optimization and effective mass increase of Cu2GeSe3, which were considered to be a synergetic effect of electrical transport properties, were achieved by the co-doping of Bi and Zn on the Cu site. This effect led to a higher Seebeck coefficient of ∼307.76 μV K–1 at 723 K for the Cu1.988Bi0.01Zn0.002GeSe3 sample. This effect also resulted in a higher power factor of ∼8.66 μW cm–1 K–2 at 723 K and an average power factor of ∼6.29 μW cm–1 K–2 at the temperature range of 303–723 K for the Cu1.988Bi0.01Zn0.002GeSe3 sample, which were ∼135 and ∼196% larger than those of pristine Cu2GeSe3, respectively, and are among the highest value of the Cu2GeSe3-based sample. Benefiting from simultaneous optimization of the power factor, the maximum ZT of ∼0.75 for the Cu1.988Bi0.01Zn0.002GeSe3 sample at 723 K was obtained, which is ∼288% higher than that of Cu2GeSe3.
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Nanomaterials
·
2023
·Vol. 13
·期 5
·865
·
IF 5.3
Yinbo Wu,Yaowei Feng,Xiulian Qiu,Fengming Ren,Jian Cen,Qingdian Chong,Ye Tian,Wei Yang
Lithium-sulfur batteries with high theoretical energy density and cheap cost can meet people’s need for efficient energy storage, and have become a focus of the research on lithium-ion batteries. However, owing to their poor conductivity and “shuttle effect”, lithium-sulfur batteries are difficult to commercialize. In order to solve this problem, herein a polyhedral hollow structure of cobalt selenide (CoSe2) was synthesized by a simple one-step carbonization and selenization method using metal-organic bone MOFs (ZIF-67) as template and precursor. CoSe2is coated with conductive polymer polypyrrole (PPy) to settle the matter of poor electroconductibility of the composite and limit the outflow of polysulfide compounds. The prepared CoSe2@PPy-S composite cathode shows reversible capacities of 341 mAh g−1at 3 C, and good cycle stability with a small capacity attenuation rate of 0.072% per cycle. The structure of CoSe2can have certain adsorption and conversion effects on polysulfide compounds, increase the conductivity after coating PPy, and further enhance the electrochemical property of lithium-sulfur cathode material.Keywords:lithium-sulfur battery;transition metal selenides;metal-organic framework;polypyrrole;sulfur host
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