ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Njemuwa Nwaji,Eser Metin Akinoglu,Biyun Lin,Xin Wang,Michael Giersig
Chains of alternating semiconductor nanocrystals are complex nanostructures that can offer control over photogenerated charge carriers dynamics and quantized electronic states. We develop a simple one-pot colloidal synthesis of complex Cu1.94S-CdS and Cu1.94S-ZnS nanochains exploiting an equilibrium driving ion exchange mechanism. The chain length of the heterostructures can be tuned using a concentration dependent cation exchange mechanism controlled by the precursor concentrations, which enables the synthesis of monodisperse and uniform Cu1.94S-CdS-Cu1.94S nanochains featuring three epitaxial junctions. These seamless junctions enable efficient separation of photogenerated charge carriers, which can be harvested for photocatalytic applications. We demonstrate the superior photocatalytic activity of these noble metal free materials through solar hydrogen generation at a hydrogen evolution rate of 22.01 mmol g–1 h–1, which is 1.5-fold that of Pt/CdS heterostructure photocatalyst particles.
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TALANTA
·
2023
·
IF 6.1
Qian Wu,Li Tian,Xiangyu Shan,Shuning Yang,Huiling Li,Chao Li,Juan Lu
A novel electrochemiluminescence (ECL) sensor was constructed for the detection of permethrin by modifying Fe 3 CuO 4 –Ru(bpy) 3 2+ and GO-CdS@ZnS on the electrode. Fe 3 CuO 4 was used as a carrier to adsorb more luminous reagent Ru(bpy) 3 2+ to promote luminescence. Meanwhile, it also can be used as a co-reaction promoter to amplify the initial signal of Ru(bpy) 3 2+ -tri-n-propylamine (TPrA) system. When GO-CdS@ZnS was introduced into this system, the ECL signal was further enhanced. The porous nature of graphene oxide (GO) was utilized to load a large amount of CdS@ZnS, in which CdS@ZnS acted as the co-reactant to amplify the ECL signal. The amount of permethrin (PMT) increased and the ECL signal decreased. Under the optimum conditions, the ECL response was linearly related to the logarithm of PMT concentration. The developed ECL sensor allowed for sensitive determination of PMT and exhibited a wide linear range from 1.0 × 10 −11 mol L −1 to 1.0 × 10 −7 mol L −1 . The limit of detection was 3.3 × 10 −12 mol L −1 (S/N = 3). It can be used for the detection of PMT in vegetable samples.
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Nano Research
·
2023
·
IF 9.9
He Xiaowei,Wang Tianshuai,Tian Lidong,Zhang Qiuyu
Heterostructure engineering by coupling different nanocrystals has received extensive attention because it can enhance the reaction kinetics of the anode of sodium-ion batteries (SIBs). However, constructing high-quality heterostructure anode materials through green and environmentally friendly methods remains a challenge. Herein, we have proposed a simple one-step method by recycling the electronic waste metal materials to synthesize the Cu 1.94 S/ZnS heterostructure materials. Combined with the experimental analysis and first principle calculations, we find that the synergistic effect of different components in heterostructure structures can significantly enhance the reversible capacity and rate performance of anode materials. Based on the constructed Cu 1.94 S/ZnS anode, we obtain a superior reversible capacity of 440 mAh·g −1 at 100 mA·g −1 and 335 mAh·g −1 after 3000 cycles at 2000 mA·g −1 . Our work sheds new light on designing high-rate and capacity anodes for SIBs through the greenness synthesis method.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Tianyu Shi,Chenyuan Zhao,Yuxiang Zhou,Haihong Yin,Changqing Song,Lin Qin,Zhiliang Wang,Haibao Shao,Ke Yu
Lithium-sulfur batteries (LSBs) are regarded as promising candidates for next-generation electrochemical energy storage systems due to their low cost and high energy density . However, the insulative sulfur, the volume expansion and high soluble polysulfides are three roots impeding their practical applications, and consequently bring challenges of low sulfur utilization, poor cyclic stability and sluggish redox kinetics. Herein, a special core–shell ZnS-CNTs/S@Ni(OH) 2 (labeled as ZnS-CNTs/S@NH) cathode has been designed to overcome above obstacles and elevate the electrochemical performance . The ZnS-CNTs/S@NH cathode is synthesized via a facile step-by-step strategy, in which ZnS-decorated CNTs was used as a framework to load sulfur and followed with a ultrathin Ni(OH) 2 (NH) layer encapsulation. The ZnS-CNT core combines merits of CNT network and polar ZnS quantum dots (QDs), accommodating the volume change, offering efficient pathways for fast electron/ion transport, and anchoring polysulfides through polar interactions. The outer Ni(OH) 2 shell physically confines the active material and meanwhile provides plenty of catalytic sites for effective polysulfide chemisorption . Benefiting from these merits, the ZnS-CNTs/S@NH cathode exhibits excellent cell performances in comparison with ZnS-CNTs/S and CNTs/S. Its discharge capacity at different C-rates is optimal in the three cathodes, which decreases from 1037.0 mAh g −1 at 0.1 C to 646.1 mAh g −1 at 2.0 C. Its cyclic capacity also manifests the slowest reduction from 861.1 to 760.1 mAh g −1 after 150 cycles at 0.5 C, showing a high retention (88.3%) and a tiny average fading rate (0.078%). The strategy in this work provides a feasible approach to design and construct core–shell cathode materials for realizing practically usable Li–S batteries.
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FOOD CHEMISTRY
·
2021
·
IF 7.514
Yanbo Wang,Junjie Ma,Huan Li,Jinru Zhou,Hong Zhang,Linglin Fu
Arginine kinase (AK) is one of the most important allergens in shrimp products. Herein, a novel immunoassay for quantitation of AK was developed using the antibody modified gold nanoparticle (AuNP) and quantum dot (QD). When the first antibody modified AuNP (AuNP-Ab1) was bridged by AK with the secondary antibody modified QD (QD-Ab2), fluorescence resonance energy transfer (FRET) would occur between the AuNP and QD, which led to a decrease in fluorescent signals. The decrease in fluorescence intensity was found to correlate linearly with the log of AK concentration in the range of 1.0 × 10 -6 -1.0 × 10 -3 mg/mL (R 2 = 0.9909) and the detection limit was 0.11 ng/mL. The immunoassay was further proved to have encouraging specificity, precision and accuracy. Compared with existing methods, this study provided a promising approach to develop a highly sensitive and selective detection method for AK in shrimp related food samples.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Qihuang Deng,Wei Xiong,Bingshuang Mao,Maolin Bo,Yefeng Feng
Increasing the dielectric constant of polymer/sulfide ceramic composites by using wide-bandgap semiconducting sulfide ceramic fillers like ZnS is difficult because of their low interface polarization. To increase the dielectric constant, in this study, ternary polymer-based composite films were designed and fabricated using a hybrid filler consisting of shell-like ZnS particles and core-like V 2 C MXene particles. First, V 2 C MXene with a multi-layered structure was synthesized from the simplest raw materials followed by the in-situ hydrothermal growth of ZnS particles around the V 2 C particles. Then, binary polymer/ZnS and ternary polymer/V 2 C–ZnS composites were fabricated, and their dielectric, conductive, and electrical breakdown properties were investigated. Finally, the effect of interfacial bonding between the V 2 C and ZnS phases was investigated by density functional theory calculations, and the contribution of V 2 C/ZnS interfacial bonding to the higher dielectric constant of the ternary composites than that of the binary composites was explained. The ternary composites exhibited balanced electrical properties suitable for energy storage applications. The ternary composite with 10 wt% hybrid filler loading exhibited a high dielectric constant of ~52, a low dielectric loss of ~0.11 at 100 Hz, and a high electrical breakdown strength of ~202 MV m −1 . This study paves the way for the facile fabrication of high-performance composite dielectrics for application in advanced capacitors.
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Micro & Nano Letters
·
2021
·Vol. 16
·期 10
·500-505
·
IF 1.102
Dejuan Fa,Yuqing Miao
By hydrothermal reaction, the hydrangea-like ZnS/ZnIn 2 S 4 microspheres were prepared in the presence of thioacetamide. X-ray photoelectron spectroscopy and high resolution transmission electron microscopy confirmed that the ultra-long nanowires are composed of ZnS and ZnIn 2 S 4 . Scanning electron microscopy showed the morphology of ultra-thin nanosheets with an average thickness of 8.5 nm cross from inside to outside, forming ZnS/ZnIn 2 S 4 microspheres with a porous diameter of about 2.8 μm. Nitrogen adsorption desorption isotherm determined that the BET specific surface area of the microspheres was 109.19 m 2 /g which showed that they have a large specific surface area. The obtained ZnS/ZnIn 2 S 4 microspheres showed broad absorbance ranging from UV (200 nm) to visible (520 nm) with low indirect band gaps of 2.08 eV. It leads to outstanding visible-light-driven photocatalysis for the degradation of xylenol orange (XO) and thymol blue (TB) in water, and the two dyes were almost completely degraded after 60 and 135 min, respectively. This provides new potential to explore nanomaterials for efficient photo-driven degradation of organic dyes under visible light irradiation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Jianwei Bai,Longqi Chen,Yawei Zhu,Xiqing Wang,Xiaodan Wu,Yujie Fu
In this study, a molecularly imprinted fluorescent sensor was constructed successfully for selective recognition of PTX by introducing methacryl polyhedral oligomeric silsesquioxane (M-POSS) to add porous structure. The obtained fluorescent sensors were prepared by grafting MIP shell on the surface of silane functionalized Mn: ZnS Quantum Dots (QDs) by a free radical polymerization process. The binding properties and selectivity of the MIP-QDs were demonstrated by adsorption capacity obtained based on fluorescence spectroscopy. These MIP-based fluorescent sensors showed good dispersibility and high stability in solution. Under the optimized conditions, the binding experiment demonstrated the fluorescent intensity of the porous fluorescent sensors was obviously decreased with the increase of PTX in the concentration range 0.1–2.0 μM and the detection limit was 0.043 μM. These results demonstrated a new type of molecularly imprinted fluorescent porous nanoparticles with potential applications for selective recognition of PTX biological samples.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Weiquan Zhan,Yuan Yuan,Bingqiao Yang,Feifei Jia,Shaoxian Song
Recovery of gold thiosulfate complex ([Au(S 2 O 3 ) 2 ] 3− ) from leaching solutions has been recognized as a tough task, which limited the industrial promotion of eco-friendly thiosulfate leaching technique. In this work, MoS 2 /ZnS nano-heterojunction as a catalyst was proposed for the recovery of [Au(S 2 O 3 ) 2 ] 3− from leaching solution. The results indicated that [Au(S 2 O 3 ) 2 ] 3− could not only be efficiently recovered, but also in-situ reduced into Au 0 when MoS 2 /ZnS nano-heterojunction being used in the leaching solution. Mo 0.45 Zn 0.10 S exhibited an extremely high reduction capacity (1120.56 mg/g), which was 4.52 and 1.72 times of ZnS and MoS 2 , respectively. The great improvement was resulted from the ZnS doping on MoS 2 , which brought stronger light absorption, higher transferred efficiency and lower recombination of photogenerated electron-hole pairs of MoS 2 . In addition, the Au 0 could completely desorpt from MoS 2 /ZnS nano-heterojunctions in Na 2 S solution in less than 4 min, leading MoS 2 /ZnS nano-heterojunction to have remarkable cycling performances. This work provided a new insight for enhancing the recovery and in-situ reduction of gold thiosulfate complex from leaching solutions.
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RSC Advances
·
2020
·Vol. 10
·期 41
·24425-24433
·
IF 3.119
Shenjie Li,Tianyong Zha,Xiaoyu Gong,Qi Hu,Minghui Yu,Jinyu Wu,Ruolan Li,Jiaming Wang,Yanyan Chen
We present a facile route for the synthesis of water-soluble Cu–Cd–Zn–S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu–Cd–Zn–S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu–Cd–Zn–S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively. It is worth noting that under the condition of a constant Cu/Cd/Zn ratio, the UV-vis absorption spectra do not change with the fluorescence spectra, indicating that the band gap of QDs remains unchanged during the change of pH value. The photoluminescence (PL) quantum yield of the as-prepared QDs with yellow emission is up to 76%. The QDs also show excellent chemical stability after the deposition of the ZnS shell. Luminescent and flexible films are fabricated by combining Cu–Cd–Zn–S QDs with polyvinyl alcohol (PVA). The QD/PVA flexible hybrid films are successfully applied on top of a conventional blue InGaN chip for remote-type warm-white LEDs. As-fabricated warm-white LEDs exhibit a higher color rendering index (CRI) of about 89.2 and a correlated color temperature (CCT) of 4308 K.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hao Lin,Jie Yang,Yong-feng Liu,Fan-ju Zeng,Xiao-Sheng Tang,Zhi-qiang Yao,Hong-ling Guan,Qian Xiong,Jia-er Zhou,Dao-fu Wu,Juan Du
As a promising energy-saving technique, the eco-friendly and low-cost solid-state white light-emitting diodes (WLEDs) based on quantum dots (QDs) have been widely studied. Herein, a WLED device prepared by core–shell structure nanocomposites based on Ag-In-S/ZnS@SiO 2 quantum dots (AIS@SiO 2 ) and carbon quantum dots (CDs) was successfully constructed. CDs were combined onto the surface of AIS@SiO 2 QDs to synthesize Ag-In-S/ZnS@SiO 2 -Carbon quantum dots (AIS-CDs) nanocomposites with a white-light emission, which successfully overcome the quenching effect of CDs induced by conventional aggregation. The as-prepared AIS-CDs nanocomposites presented high stability and a photoluminescence quantum yield (PLQY) of 35%. Moreover, the corresponding AIS-CDs nanocomposites-based WLEDs demonstrated the color coordinate of (0.32, 0.33), which is comparable to the pure white light (0.33, 0.33); furthermore, the luminous efficiency of the as-prepared WLEDs showed 15.1 lm W −1 . These results reported herein may open up a new avenue for the development of high-performance, low-cost, and environmentally-friendly WLEDs.
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Solar RRL
·
2021
·Vol. 5
·期 11
·2100536
·
IF 8.582
Yujie Liu,Qiaohong Zhu,Muhammad Tayyab,Liang Zhou,Juying Lei,Jinlong Zhang
Semiconductor supported noble metal nanoparticles are widely used in H 2 evolution. Due to the high cost and low catalytic efficiency of noble metals, single-atom catalysts (SACs) are considered as very potential materials to overcome these shortcomings. Herein, the construction of the ZnO–ZnS heterojunction with an excess amount of Zn vacancies promotes the separation of charge carriers and improves the utilization of electrons. Meanwhile, the zinc vacancies on ZnS provide effective anchor sites for Pt atoms, which is beneficial to obtain highly dispersed single Pt atoms catalyst (ZOS-SAPt). Due to the formation of an intermediate energy level by zinc vacancies, the introduction of Pt single atoms promotes the novel type-V electron transport from the conduction band of ZnO to the intermediate energy level and then to the Pt atom. The type-V electron transport not only retains the high reduction potential of photogenerated electrons, but also avoids the loss of carriers. The resultant ZOS-SAPt shows outstanding photocatalytic performance for H 2 evolution under simulated sunlight, reaching 9.6 mmol g −1 h −1 , which is 201 times that of ZnO–ZnS. These results provide important information for further development of photocatalysts.
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