JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 23
·27524-27533
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IF 2.478
Wang Wenbo,Liu Botao,Lv Xiaomeng
To achieve adaptation to the heat dissipation effect of electronic devices in the 5G era and improvement of the anisotropic thermal conductivity of the insulating polymer, three-dimensional (3D) PU@BNNS-OH network structure was constructed via layer-by-layer assembly with polyurethane (PU) foam as the robust skeleton of three-dimensional structure, and hydroxylated boron nitride nanosheet (BNNS-OH) as thermal conductive filler. Then PU@BNNS-OH was composited with polyvinyl alcohol (PVA) via microwave-assisted curing method to get the final thermal conductivity composites (PVA/PU@BNNS-OH). The result showed that the interconnected thermal conductivity network was significantly effective in improving the anisotropic thermal conductivity of the composite with high-temperature endurance and moderate mechanical property. When the BNNS-OH coating is 10 wt%, the optimal thermal conductivity of the composite is 4.68 W · \({\mathrm{m}}^{-1}\) · \({\mathrm{K}}^{-1}\) and the thermal conductivity enhancement efficiency is 45.50, which is significantly higher than others reported in the literature. Both the finite element analysis and thermal infrared analysis indicated that the thermal conductivity of the composites was significantly improved and paved the way for its potential application. The present microwave-assisted synthesis strategy is fast and energy-saving and can be widely used for synthesizing different insulated polymer-based thermal interface materials.
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Electrocatalysis
·
2021
·Vol. 13
·期 1
·37-46
·
IF 2.713
He Xiong,Liu Baosheng,Zhang Shaohui,Li Hongda,Liu Jinghua,Sun Zijun,Chang Haixin
Herein, vertically aligned nickel nitrate hydroxide (NiNH) holey nanosheet arrays are controllably in situ grown on nickel foam (NF) via a facile one-step solvothermal method. Unique architecture constructed with two-dimensional (2D) holey nanosheets provides high exposure of active sites and benefits mass transport of electrolyte, which is favorable for OER electrocatalysis. Holey structure maintains through the structural conversion from NiNH to γ-NiOOH during OER activation. The vertically aligned γ-NiOOH porous nanosheet arrays exhibit tight adhesion on NF and sufficient Ni 2+ /Ni 3+ redox species, which guarantee OER activity and durable stability. Optimal OER activity with overpotential of 231 mV at 50 mA/cm 2 , a Tafel slope of 123 mV/dec and a good stability can be achieved in 1 M KOH solution, which is superior to most previous reported transition metal-based electrocatalysts. Our work can provide a facile strategy to obtain highly efficient holey OER electrocatalysts. Graphic Abstract
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JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH
·
2021
·Vol. 40
·期 1
·1-16
·
IF 11.161
Ye Lili,Chen Yaoming,Mao Jizong,Lei Xiaotian,Yang Qian,Cui Chunhui
Background The exploitation of novel nanomaterials combining diagnostic and therapeutic functionalities within one single nanoplatform is challenging for tumor theranostics. Methods We synthesized dendrimer-modified gold nanorods for combinational gene therapy and photothermal therapy (PTT) of colon cancer. Poly(amidoamine) dendrimers (PAMAM, G3) grafted gold nanorods were modified with GX1 peptide (a cyclic 7-mer peptide, CGNSNPKSC). The obtained Au NR@PAMAM-GX1 are proposed as a gene delivery vector to gene (FAM172A, regulates the proliferation and apoptosis of colon cancer cells) for the combination of photothermal therapy (PTT) and gene therapy of Colon cancer cells (HCT-8 cells). In addition, the CT imaging function of Au NR can provide imaging evidence for the diagnosis of colon cancer. Results The results display that Au NR@PAMAM-GX1 can specifically deliver FAM172A to cancer cells with excellent transfection efficiency. The HCT-8 cells treated with the Au NR@PAMAM-GX1/FAM172A under laser irradiation have a viability of 20.45%, which is much lower than the survival rate of other single-mode PTT treatment or single-mode gene therapy. Furthermore, animal experiment results confirm that Au NR@PAMAM-GX1/FAM172A complexes can achieve tumor thermal imaging, targeted CT imaging, PTT and gene therapy after tail vein injection. Conclusion Our findings demonstrate that the synthesized Au NR@PAMAM-GX1 offer a facile platform to exert antitumor and improve the diagnostic level of tumor.
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高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-13
·
IF 14.919
Guo Wei,Zhang Wanying,Si Yubing,Wang Donghai,Fu Yongzhu,Manthiram Arumugam
The interfacial instability of the lithium-metal anode and shuttling of lithium polysulfides in lithium-sulfur (Li-S) batteries hinder the commercial application. Herein, we report a bifunctional electrolyte additive, i.e., 1,3,5-benzenetrithiol (BTT), which is used to construct solid-electrolyte interfaces (SEIs) on both electrodes from in situ organothiol transformation. BTT reacts with lithium metal to form lithium 1,3,5-benzenetrithiolate depositing on the anode surface, enabling reversible lithium deposition/stripping. BTT also reacts with sulfur to form an oligomer/polymer SEI covering the cathode surface, reducing the dissolution and shuttling of lithium polysulfides. The Li–S cell with BTT delivers a specific discharge capacity of 1,239 mAh g −1 (based on sulfur), and high cycling stability of over 300 cycles at 1C rate. A Li–S pouch cell with BTT is also evaluated to prove the concept. This study constructs an ingenious interface reaction based on bond chemistry, aiming to solve the inherent problems of Li–S batteries.
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IONICS
·
2021
·Vol. 27
·期 8
·3553-3566
·
IF 2.817
Zhang Boyuan,Song Senyang,Li Wenyue,Zheng Lewen,Ma Xiaoyan
Design and construction of multiphase nanostructures of metal organic frameworks (MOF) has recently been considered an effective method for the preparation of synergistic and excellent performance supercapacitor materials. Herein, Ni-Co-Mn-based metal organic frameworks (Ni-Co-Mn MOF) are prepared through an effortless one-step hydrothermal method, in which multiple metal nodes were evenly distributed between MOF nanostructure through ligands and formed a multiphase nanostructure through synergy. The synthesized Ni-Co-Mn 0.25 MOF exhibits a prominent specific capacitance of 1575 F g −1 at 1 A g −1 , remarkable rate capability and cycling stability. Moreover, we constructed an asymmetrical supercapacitor, which performed an excellent energy density of 73.56 Wh kg −1 at a power density of 399 W kg −1 and great cycling stability with 81.64% of original capacitance after 5000 cycles. Ni-Co-Mn MOF is a promising hybrid electrode material for excellent performance supercapacitor as well as it provides a simple and economic way to fabricate supercapacitor composite materials.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 7
·2021-2032
·
IF 2.647
Li Libo,Xie Ming,Zhang Yonghong,Xu Yanping,Li Jia,Shan Yuhang,Zhao Yangmingyue,Zhou Da,Chen Xiaochuan,Cui Wenjun
This work obtained gel polymer electrolytes (GPEs) via in situ polymerization of methyl methacrylate (MMA) in the environment of lithium bis(trifluoromethane sulfonyl)imide (LiTFSI) and N-methyl-N-propylpyrrolidinium bis(trifluoromethane sulfonyl)amide (Py13TFSI). The thermogravimetric analysis (TGA) and the differential scanning calorimeter (DSC) determined the non-isothermal decomposition of Py13TFSI/LiTFSI/PMMA polymer electrolyte for Li-ion battery. TGA, DSC, and the infrared graph analyzed thermodynamic properties, and the results showed the addition of Py13TFSI significantly improved the thermostability of electrolytes. Flynn-Wall-Ozawa (Ozawa), Kissinger-Akahira-Sunose (KAS), and Friedman methods applied for kinetics characteristics to activation energy ( E a ) and pre-exponential factor ( A ). The E a value from Ozawa and KAS methods was 208.478 kJ mol −1 and 207.423 kJ mol −1 , respectively.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4557-4566
·
IF 1.938
Liu Gu,Zhang Yukun,Xu Kejun,Wang Liuying,Xiong Shanxin
Composite supercapacitive materials can combine two different kinds of electrode materials with different energy storage mechanisms, as well as present enhanced supercapacitive performance. In this paper, a reduced graphene oxide aerogel (GA) was prepared with an adjustable pore structure and used as a matrix for loading of secondary active material (MnO 2 ) through an electrochemical deposition method. The influences of the deposition time and deposition voltage on the electrochemical behaviors and specific capacitances of MnO 2 /GA composites were studied. The unique three-dimensional porous structure of GA can act as a good matrix for MnO 2 . The results show that when the deposition time is 30 s and deposition voltage is 1.0 V, the MnO 2 /GA composite has the highest specific capacitance of 664 F/g at a current density of 1 A/g. Compared with neat GA, the specific capacitance of the MnO 2 /GA composite is enhanced by 190%, which can be assigned to the co-contribution of two kinds of active materials, a facile ion diffusion path through the porous structure, and good electron conductivity of the GA.
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Nano Research
·
2021
·Vol. 14
·期 8
·2875-2883
·
IF 8.897
Xu Xiaowen,Chen Yucheng,He Pei,Wang Song,Ling Kai,Liu Longhui,Lei Pengfei,Huang Xianjun,Zhao Hu,Cao Jianyun,Yang Junliang
Strain sensors with good stability are vital to the development of wearable healthcare monitoring systems. However, the design of strain sensor with both duration stability and environmental stability is still a challenge. In this work, we propose an ultra-stable and washable strain sensor by embedding a coupled composite film of carbon nanotube (CNT) and Ti 3 C 2 T x MXene into polydimethylsiloxane (PDMS) matrix. The composite strain sensor with embedded microstructure and uneven surface makes it conformal to skin, while the CNT/MXene sensing layer exhibits a resistance sensitive to strain. This sensor shows reliable responses at different frequencies and with long-term cycling durability (over 1,000 cycles). Meanwhile, the CNT/MXene/PDMS composite strain sensor provides the advantages of superior anti-interference to temperature change and water washing. The results demonstrate less than 10% resistance changes as the temperature rises from −20 to 80 °C or after sonication in water for 120 min, respectively. The composite sensor is applied to monitor human joint motions, such as bending of finger, wrist and elbow. Moreover, the simultaneous monitoring of the electrocardiogram (ECG) signal and joint movement while riding a sports bicycle is demonstrated, enabling the great potential of the as-fabricated sensor in real-time human healthcare monitoring.
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RARE METALS
·
2021
·Vol. 40
·期 12
·3685-3693
·
IF 4.003
Xie An,Mao Shen-Wei,Chen Tian-Jiang,Yang Hui,Zhang Ming
In general, inorganic filler/polyurethane elastomer (PUE) composites possess favorable properties, such as modulus, chemical resistance, and heat stability, are promising for broadening the application area of polyurethanes (PU). For the experiments, a series of cerium oxide (CeO 2 )/PUE composites were prepared with different sizes and appearance of CeO 2 , and different mixing methods as well. CeO 2 particles with different sizes were added into PUs during the formation of urethane linkage and the chain-extend process, respectively. The morphology along with mechanical properties, thermal properties of the composites were studied. The results suggest that the size of CeO 2 and mixing methods influence the microstructure of PUs which has profound effect on properties of these composites. The composites tend to form more quantity of hard domains (HDs) with small size when CeO 2 particles were added before the formation of urethane linkage, whereas CeO 2 particles increase the size of HDs when added with chain extender into PU prepolymer. Graphic abstract
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Nature Catalysis
·
2021
·Vol. 4
·期 3
·202-211
·
IF 41.813
Liu Hongfei,Xia Jun,Zhang Nan,Cheng Han,Bi Wentuan,Zu Xiaolong,Chu Wangsheng,Wu HengAn,Wu Changzheng,Xie Yi
Conventional strategies for modifying electrocatalysts for efficient CO 2 reduction are mainly based on doping, defect/morphology engineering, substrate design and so on. In most cases, these methods can only tune their structures, electronic states and thereby catalytic properties in a gradual way. Here we report that the solid–liquid phase transition of Ga–Sn/Ga–In alloys can induce an instant and radical transformation of their atomic and electronic structures during electrocatalysis, which dramatically impacts their catalytic properties. The transition of Sn/In active components from phase-segregated clusters to dispersed single atoms during melting results in a unique electronic structure through further reduction of both metallic Sn/In and Ga. Such atomic/electronic structure transitions can correlate well with suppression of the hydrogen evolution reaction and an enhanced formate Faradaic efficiency from <35% to >95%. This two-state switching strategy may be extended to other catalytic reactions to determine correlations between their structures and catalytic properties.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 4
·1-10
·
IF 5.833
Liu Wendong,Guo Junnan,Chen Chuanxia,Ni Pengjuan,Jiang Yuanyuan,Zhang Chenghui,Wang Bo,Lu Yizhong
Enzyme-mimetic properties of nanomaterials can be efficiently tuned by controlling their size, composition, and structure. Here, ultrathin PdCu alloy nanosheet–assembled three-dimensional (3D) nanoflowers (Pd 1 Cu x NAFs) with tunable surface composition are obtained via a generalized strategy. In presence of H 2 O 2 , the as-synthesized Pd 1 Cu x NAFs can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to the oxidized form of TMB (oxTMB) with a characteristic absorption peak at 652 nm. Interestingly, Pd 1 Cu x NAFs show obviously composition-dependent peroxidase-like catalytic activities because of the synergistic interaction of nanoalloy. Additionally, different from 2D Pd nanosheets, the distinctive 3D superstructures are featured with rich approachable sites and proper layer spacing, which are in favor of fast mass transport and electron transfers during the catalytic process. Among the studied Pd 1 Cu x NAFs, the Pd 1 Cu 1.7 NAFs show the highest enzyme-like activities and can be successfully applied for the colorimetric detection of glucose with a low detection limit of 2.93 ± 0.53 μM. This work provides an efficient avenue to fabricate PdCu NAF nanozymes in biosensing toward glucose detection. Graphical abstract
Two-dimensional (2D) PdCu ultrathin nanosheet–assembled 3D nanoflowers (Pd 1 Cu x NAFs) with tunable surface composition exhibit substantially enhanced intrinsic peroxidase-like catalytic activities. The Pd 1 Cu 1.7 NAFs are successfully used as peroxidase mimic catalyst for the colorimetric detection of glucose with low detection limit of 2.93 μM.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 11
·3017-3026
·
IF 4.157
Ren Zixuan,Zhou Xingchen,Gao Xingxing,Tan Yan,Chen Huaying,Tan Songwen,Liu Wenfang,Tong Yaonan,Chen Chuanpin
The long-term consumption of food with pesticide residues has harmful effects on human health and the demand for pesticide detection technology tends to be miniaturized and instant. To this end, we demonstrated the first application of indirectly detecting two carbamate pesticides, metolcarb and carbaryl, by gold nanoparticle–modified indium tin oxide electrode in dual-channel microchip electrophoresis and amperometric detection (ME-AD) system. m -Cresol and α -naphthol were obtained after pesticide hydrolysis in alkaline solution, and then separated and detected by ME-AD. Parameters including the detection potential and running buffer concentration and pH were optimized to improve the detection sensitivity and separation efficiency. Under the optimal conditions, the two analytes were completely separated within 80 s. m -Cresol and α -naphthol presented a wide linear range from 1 to 100 μM, with limits of detection of 0.16 μM and 0.34 μM, respectively (S/ N = 3). Moreover, the reliability of this system was demonstrated by analyzing metolcarb and carbaryl in spiked vegetable samples. Graphical abstract
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