Nanomaterials
·
2022
·Vol. 12
·期 7
·1137
·
IF 5.719
Chubin He,Xiuru Xu,Yang Lin,Yang Cui,Zhengchun Peng
Conductive hydrogels are widely used in sports monitoring, healthcare, energy storage, and other fields, due to their excellent physical and chemical properties. However, synthesizing a hydrogel with synergistically good mechanical and electrical properties is still challenging. Current fabrication strategies are mainly focused on the polymerization of hydrogels with a single component, with less emphasis on combining and matching different conductive hydrogels. Inspired by the gradient modulus structures of the human skin, we propose a bilayer structure of conductive hydrogels, composed of a spray-coated poly(3,4-dihydrothieno-1,4-dioxin): poly(styrene sulfonate) (PEDOT:PSS) as the bonding interface, a relatively low modulus hydrogel on the top, and a relatively high modulus hydrogel on the bottom. The spray-coated PEDOT:PSS constructs an interlocking interface between the top and bottom hydrogels. Compared to the single layer counterparts, both the mechanical and electrical properties were significantly improved. The as-prepared hydrogel showed outstanding stretchability (1763.85 ± 161.66%), quite high toughness (9.27 ± 0.49 MJ/m3), good tensile strength (0.92 ± 0.08 MPa), and decent elastic modulus (69.16 ± 8.02 kPa). A stretchable strain sensor based on the proposed hydrogel shows good conductivity (1.76 S/m), high sensitivity (a maximum gauge factor of 18.14), and a wide response range (0–1869%). Benefitting from the modulus matching between the two layers of the hydrogels, the interfacial interlocking network, and the patch effect of the PEDOT:PSS, the strain sensor exhibits excellent interface robustness with stable performance (>12,500 cycles). These results indicate that the proposed bilayer conductive hydrogel is a promising material for stretchable electronics, soft robots, and next-generation wearables.Keywords:conductive hydrogels;bilayer structure;interface robustness;wearable sensors
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2024
·
IF 3.2
Jingkun Chen,Xue Yang,Yucheng Li,Minghui Xu,Xuechun Yang,Jian Tang,Pu Zheng,Jie Yan,Jingtai Zhao,Qianli Li
The development of high-speed imaging technology requires ultrafast scintillators. ZnO is an excellent scintillator whose near-band-edge (NBE) radiation attenuation can reach subnanosecond levels. Homogeneous and unique double-layered ZnO:Sc microcrystals (1% doping) were prepared by adding polyvinylpyrrolidone during a hydrothermal reaction. The growth process of double-layer ZnO:Sc microcrystals and the effects of Sc doping concentration on the morphology of ZnO:Sc microcrystals were studied. ZnO:Sc tended to nucleate into twins in weakly basic hexamethylenetetramine. The c-axis growth of ZnO was inhibited by Sc doping, and the growth pyramid of ZnO:Sc was in accordance with the Burton–Cabrera–Frank growth model in the (002) plane, according to the spiral dislocation. Sheet ZnO:Sc microcrystals were obtained under high-concentration Sc doping. After hydrogen annealing, the NBE intensity of 0.5%-doped ZnO:Sc microcrystals was higher than that of ZnO, mainly owing to inhibition of defect luminescence and sheet morphology, which reduced the self-absorption of ZnO:Sc. The decay time of the ZnO:Sc microcrystals after hydrogen annealing under ultraviolet excitation was less than 1 ns. Combining the annealed microcrystals with polydimethylsiloxane to form a flexible composite film enables the scintillation screen to be used for ultrafast X-ray detection with a spatial resolution of up to 16 lp/mm.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 44
·期 12
·1600-1607
·
IF 1.634
Daixiong Zhang,Rui Pei,Xiofei Peng,Qing Xiang,Xia Wang
In this study, nano-Al/Fe 2 O 3 bilayer was successfully formed via aqueous electrophoretic deposition (EPD) route for the first time. For this formation, the first layer of nano-Fe 2 O 3 was prepared by EPD using the bi-additive of 0.015 mM HCl+10 mg L −1 PEI, and then the second layer of nano-Al was immediately prepared by EPD using 5 mg L −1 PEI as additive. The electrophoretic nano-Al/Fe 2 O 3 bilayer had high heat release of ∼2800 J g −1 and exhibited good combustion performance. In comparison with the previous work realized by using organic-solvent-EPD, we believe this study can pave a new way for preparing the bilayers of nanothermites or metallic reactive materials by more cost-effective and environment-friendly aqueous EPD route.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 5
·1-9
·
IF 23.2
Shen Yong,Li Guojie,Cheng Yajie,Li Yahong,Alhadhrami A.,Fallatah Ahmed M.,Alshammari Dalal A.,Zhou Bing,Feng Yuezhan,Liu Chuntai
Developing a multifunctional protection material compatible with infrared (IR) stealth and electromagnetic interference (EMI) shielding is urgently required but challenging to ensure special human safety and maintain the smooth operation of electronic equipment. Herein, it is designed and fabricated a double-layered ANF/MXene film containing a thermally insulated aramid nanofiber (ANF) aerogel and low emissivity MXene coating with integrated long-term thermal camouflage at elevated temperatures and highly efficient EMI shielding capability. In this system, the lower aerogel film can act as a barrier to insulate heat transfer through its novel skin–core structure under ultralow directional thermal conduction, while the upper Ti 3 C 2 T x MXene coating can provide a very low emissivity surface and highly conductive network. Owing to its unique double-layer structure, the ANF/MXene film demonstrates a significant EMI shielding effectiveness of 43.6 dB and a remarkably low emissivity of 0.24, delivering excellent IR stealth performance across various ambient temperatures. This research lays the foundation for the creation of versatile protective materials that have great potential for use in both military and civilian contexts.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 12
·2897-2908
·
IF 4.696
Jun Peng,Yuxiu Xing,Kai Xu,Weihong Lin,Jiancheng Wu,Zhiwei Yu,Youxiong Zhang,Mingcai Chen
In this work, a facile strategy to fabricate double-layer nano-wrinkled structures by coupling the polymeric surface onto silsesquioxane rigid templates has been proposed. Aza-Michael addition was applied to construct the bulk layer by using octakis(aminophenyl) silsesquioxane (OAPS) and decakis(methacryloxypropyl) silsesquioxane (CMSQ-T10). Subsequently, a top layer was fabricated through free-radical polymerization of octakis(methacryloxypropyl) silsesquioxane (CMSQ-T8) and hexafluorobutyl acrylate (HFBA). For the first time, well defined nanoisland structures were achieved via reaction-induced assembly of two kinds of silsesquioxane cages in the rigid layer, which could further serve as an in situ template or a scaffold for top polymerization. As a result, the template role of the bulk layer and compressive stress caused by mismatch of different volumetric shrinkages of reactions between top and bulk layers led to the double-layer nano-wrinkled structures, which could be observed using a Field Emission Scanning Electron Microscope (FE-SEM) and an Atomic Force Microscope (AFM). Moreover, by tuning bilayer formulations, controllable nano-wrinkled structures can be obtained. The minimum reflectance of resulting nano-wrinkled surface is decreased to 3.51 ± 0.03% (maximum transmittance 98.51 ± 0.02%). Furthermore, the resulting surface shows obvious hydrophobicity and superior thermal stability, thus suggesting its potential use as antireflective surfaces in optical devices, solar cells and various optoelectronic devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 19
·6542
·
IF 4.927
Jialing Chen,Qing Li,Ruijie Du,Xinke Yu,Zhili Wan,Xiaoquan Yang
Responsive dual-structured emulsions and gel emulsions have attracted more and more attention due to their complex microstructures, on-demand responsive properties, and controlled release of active cargoes. In this work, the effect of monoglyceride (MG)-based oil phase structuring on the formation and stability, structural properties, and thermoresponsive and cargo release behavior of gel emulsions stabilized by glycyrrhizic acid (GA) nanofibrils were investigated. Owing to the formation of GA fibrillar networks in the aqueous phase and MG crystalline networks in the oil phase, a stable dual-structured gel emulsion can be successfully developed. The microstructure of the dual-structured gel emulsions largely depended on the concentration of MG in the oil phase. At low MG concentrations (1–2 wt%), the larger formed and lamellar MG crystals may pierce the interfacial fibrillar film, inducing the formation of partially coalesced droplets. In contrast, at high MG concentrations (4 wt% or above), the smaller MG crystals with enhanced interfacial activity can lead to the formation of a bilayer shell of GA nanofibrils and MG crystals, thus efficiently inhibiting the interfacial film damage and forming a jamming structure with homogeneously distributed small droplets. Compared to pure GA nanofibril gel emulsions, the GA−MG dual-structured gel emulsions showed significantly improved mechanical performance as well as good thermoresponsive behavior. Moreover, these stable GA−MG gel emulsions can be used as food-grade delivery vehicles for encapsulating and protecting hydrophobic and hydrophilic bioactive cargoes. They also have great potential as novel and efficient aroma delivery systems showing highly controlled volatile release. The dual-structured emulsion strategy is expected to broaden the applications of natural saponin GA-based gel emulsions in the food, pharmaceutical, and personal care industries.Keywords:glycyrrhizic acid;monoglyceride;dual-structured gel emulsions;thermoresponsive;controlled release
研究领域:
食品科学
·
药学
·
个人护理产品
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Microsystems & Nanoengineering
·
2023
·Vol. 9
·期 1
·1-14
·
IF 7.9
Xue Hailing,Wang Dongyang,Jin Mingyan,Gao Hanbing,Wang Xuhui,Xia Long,Li Dong’ang,Sun Kai,Wang Huanan,Dong Xufeng,Zhang Chi,Cong Fengyu,Lin Jiaqi
Noninvasive brain–computer interfaces (BCIs) show great potential in applications including sleep monitoring, fatigue alerts, neurofeedback training, etc. While noninvasive BCIs do not impose any procedural risk to users (as opposed to invasive BCIs), the acquisition of high-quality electroencephalograms (EEGs) in the long term has been challenging due to the limitations of current electrodes. Herein, we developed a semidry double-layer hydrogel electrode that not only records EEG signals at a resolution comparable to that of wet electrodes but is also able to withstand up to 12 h of continuous EEG acquisition. The electrode comprises dual hydrogel layers: a conductive layer that features high conductivity, low skin-contact impedance, and high robustness; and an adhesive layer that can bond to glass or plastic substrates to reduce motion artifacts in wearing conditions. Water retention in the hydrogel is stable, and the measured skin-contact impedance of the hydrogel electrode is comparable to that of wet electrodes (conductive paste) and drastically lower than that of dry electrodes (metal pin). Cytotoxicity and skin irritation tests show that the hydrogel electrode has excellent biocompatibility. Finally, the developed hydrogel electrode was evaluated in both N170 and P300 event-related potential (ERP) tests on human volunteers. The hydrogel electrode captured the expected ERP waveforms in both the N170 and P300 tests, showing similarities in the waveforms generated by wet electrodes. In contrast, dry electrodes fail to detect the triggered potential due to low signal quality. In addition, our hydrogel electrode can acquire EEG for up to 12 h and is ready for recycled use (7-day tests). Altogether, the results suggest that our semidry double-layer hydrogel electrodes are able to detect ERPs in the long term in an easy-to-use fashion, potentially opening up numerous applications in real-life scenarios for noninvasive BCI.
研究领域:
生物医学工程
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2023
·
IF 6.9
Lei Wang,Ruijian Liu,Hongmei Luan,Yiming Wang,Letu Siqin,Shuyu Li,Jiayong Zhang,Bin Yao,Chengjun Zhu
The absorbers of kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) that have undergone rapid thermal process (RTP) selenization typically exhibit a double-layer structure, with a fine crystal layer at the bottom, which degrades the performance of devices. We propose an efficient strategy for actively constructing the double-layer absorber to improve the quality of the small grains in the bottom layer. Compared to traditional methods, this method ensures uniform element distribution, particularly for Se element, and enables a more desirable Cu-poor and Zn-rich composition with a Zn/Sn ratio closer to the standard stoichiometric ratio, resulting in a reduction in harmful internal defects. This strategy eliminates small grains at the bottom and decreases grain boundary formation, resulting in a dense double-layer structure. The high-quality CZTSSe absorber not only reduces carrier recombination during back transmission, further reducing reverse saturation current (J 0 ) and increasing optical current density (J L ), but also enhances shunt resistance (R sh ) and decreases series resistance (R S ). The estimated contribution percent for PCE improvement due to changes in J L , J 0 , R sh , R S , and A are 17.20 %, 120.01 %, 1.15 %, 6.50 %, and -44.86 %, respectively. Ultimately, the highest photoelectric conversion efficiency (PCE) increased from 8.73 % to 10.49 %, and device uniformity improved considerably. This study highlights the significance of optimizing the microstructure of CZTSSe absorber layer in enhancing the performance of CZTSSe solar cells, and will provide guidance for producing high-quality CZTSSe absorber layers.
研究领域:
材料科学
·
太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Youjun Xing,Wenxiao Sun,Shengrui Cui,Wei Liu,Yongcheng Jin
In recent years, the rapid development of new electric vehicles has ushered in a golden age of lithium-ion battery research. In this research, surfactant induced carbon-decorated nanoplates LiCoPO4 were successfully prepared using a combination of solvothermal treatment and the carbonization process. The results show that the incorporation of cetyltrimethylammonium bromide (CTAB) surfactant presents dual influences on the preparation process of LiCoPO4 cathode materials. The first one is that CTAB could introduce micelles into the hydrothermal synthesis system to facilitate the reduction of grain size, therefore shortening the lithium-ion transmission path. Another is a unique carbon coating with dual layer structure that was formed during a sintering process due to the presence of a carbon substance derived from CTAB in the solvothermal treatment, resulting in nitrogen doping in the carbon layer and the formation of Co–N bonds on the surface. After optimization of the preparation, LiCoPO4 with the incorporation of 0.2 mmol of CTAB exhibited a high lithium-ion diffusion coefficient of 5.99 × 10–14 cm2 s–1 and an initial specific capacity of 120.1 mAh g–1 at 1 C, and its capacity retention ratio was 84.6% after 400 cycles. Furthermore, this material also delivered an initial specific capacity of 113.0 mAh g–1 at a high current rate of 5 C. The preparation method of materials presented here offers a promising strategy to enhance the feasibility of industrial application for high voltage olivine LiCoPO4.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2017
·Vol. 4
·期 6
·1600948
·
IF 4.279
Xichang Bao,Junyi Wang,Yuan Li,Dangqiang Zhu,Ying Wu,Peipei Guo,Xuefei Wang,Yongchao Zhang,Jiuxing Wang,Hin-Lap Yip,Renqiang Yang
Interface engineering is an important aspect for the improvement of perovskite solar cells (PVSCs). The hole transport layer with good interface contact, transport capability, and matched energy level is indispensable and critical for high-performance photovoltaic devices. Herein, anode interface engineering with an excellent compatible bilayer of poly(3,4-ethylene dioxythiophene):poly(styrenesulfo-nate)/poly(3,4-ethylene dioxythiophene) (PEDOT:PSS/PEDOT) doped with grafted sulfonated-acetone–formaldehyde lignin (PEDOT:GSL) via a low-temperature and water-soluble process is presented. As a water-processable interface material, PEDOT:GSL exhibits higher conductivity, as well as better structural and electronic homogeneities compared with PEDTO:PSS. Consequently, the PEDOT:PSS/PEDOT:GSL bilayer with tuned energy level, optical properties, and the combination of the trap passivation of GSL at the anode/perovskite interface can greatly improve charge extraction ability and reduce the interface recombination. Simultaneously, the homogeneous perovskite film is fabricated through optimizing the annealing process. The device with the power conversion efficiency up to 17.80% is achieved, with 32.6% improvement compared to PEDOT:PSS-only device (13.42%). Our success to achieve high-performance inverted PVSCs provides new understanding of PEDOT:PSS, and also new guidelines for anode interface engineering to further advancement of PVSCs. This promising approach paves the way to realize solution processable highly efficient PVSCs for potential practical applications.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 16
·期 9
·1-12
·
IF 6.048
Ma Tao,Hui Haiqing,You Xiaofei,Pei Zhiqiang,Tian Miao,Wu Bing
Nanofibre-supported forward osmosis (FO) membranes have gained popularity owing to their low structural parameters and high water flux. However, the nanofibrous membranes are less stable in long-term use, and their fouling behaviours with foulants in both feed solution (FS) and draw solution (DS) is less studied. This study developed a nanofibrous thin-film composite (TFC) FO membrane by designing a tiered dual-layer nanofibrous substrate to enhance membrane stability during long-term usage and cleaning. Various characterisation methods were used to study the effect of the electrospun nanofibre interlayer and drying time, which is the interval after removing the M-phenylenediamine (MPD) solution and before reacting with trimesoyl chloride (TMC) solution, on the intrinsic separation FO performance. The separation performance of the dual-layer nanofibrous FO membranes was examined using model foulants (sodium alginate and bovine serum albumin) in both the FS and DS. The dual-layer nanofibrous substrate was superior to the single-layer nanofibrous substrate and showed a flux of 30.2 L/m 2 /h (LMH) when using 1.5 mol/L NaCl against deionised (DI) water in the active layer facing draw solution (AL-DS) mode. In the fouling test, the water flux was effectively improved without sacrificing the water/solute selectivity under the condition that foulants existed in both the FS and DS. In addition, the dual-layer nanofibrous TFC FO membrane was more robust during the fouling test and cleaning.
研究领域:
材料科学
·
环境工程
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2016
·Vol. 120
·期 12
·
IF 2.101
Hao Song,Yang Bingchu,Gao Yongli
Compared with the most studied monolayer MoS 2 , bilayer MoS 2 possesses many distinct fascinating physical properties and potential applications owing to interlayer interactions and structural symmetry. Here, bilayer MoS 2 domains with strict identical AB Bernal stacked order were controllably synthesized using chemical vapor deposition method. In addition, the electrostatic properties of bilayer MoS 2 were systematically investigated by multiple means of photoemission electron microscopy, electrostatic force microscopy, and kelvin probe force microscopy. We found that the work function of monolayer MoS 2 is homogeneous across single crystals and polycrystalline films except for grain boundaries. However, the work function of the Bernal stacked bilayer MoS 2 decreases by 50 ± 4 meV compared with that of monolayer MoS 2 due to the interlayer coupling and screening effects. The deeper understanding gained here on the electrostatic properties of the AB Bernal stacked bilayer MoS 2 should help in the creation of next-generation electronic and optoelectronic devices.
研究领域:
材料科学
·
物理化学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）