Polymer Chemistry
·
2014
·Vol. 5
·期 20
·6097-6107
·
IF 5.368
Yongjun Tang,Chao Chen,Yun Sheng Ye,Zhigang Xue,Xingping Zhou,Xiaolin Xie
The sulfonated polyphenylsulfone (SPPSU) membranes with different degrees of sulfonation (DS) were prepared for fabricating low-cost and high-performance ionic polymer–metal composite (IPMC) actuators. The properties of SPPSU ion exchange membranes and the electromechanical performance of resulting SPPSU actuators can be manipulated by controlling their DS. As the DS of SPPSU membranes increases, their ion exchange capacity (IEC), water uptake and ion conductivity increase accordingly, whereas the hydrated mechanical properties (strength and modulus) decrease. The SPPSU membrane with the highest DS (SPPSU4) shows much higher IEC and water uptake, and slightly lower ion conductivity than those of the traditional Nafion membrane. Among the prepared IPMC actuators, the SPPSU4 actuator performs the best in the bending deformation under the electric stimulus. The maximum bending strain (MBS) of the SPPSU4 actuator is comparable to that of the Nafion actuator coupled with several times faster bending response at 3 V DC voltage. Compared with the Nafion system, the SPPSU4 actuator increases approximately twice at MBS under a sinusoidal voltage of 3 V at 1 Hz. This greatly enhanced actuation performance indicates that the SPPSU is a candidate to substitute Nafion in the field of IPMC actuators.
研究领域:
材料科学
·
仿生工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 41
·22278-22288
·
IF 14.511
Junji Chen,Wenjing Qin,Kun Li,Lei Feng,Jianxing Chen,Hanying Qiao,Min Yang,Zhenhao Tian,Xinxin Li,Changshun Gu,Yanli Wang,Zheng Gong,Shougen Yin
Ti3C2Tx MXene has a high specific surface area and high conductivity, and can be used in the field of humidity sensing. By controlling the surface termination and microstructure of the material, it is expected to improve the humidity sensing performance of Ti3C2Tx MXene. In this paper, we report a method of electrolytic intercalation treatment of Ti3C2Tx MXene in NaOH solution. Theoretical and experimental results show that this method can remove the original F terminations from the surface of Ti3C2Tx MXene and form a large number of OH and O terminations. The partial oxidation of the surface and the replacement of terminations and the insertion of Na+ lead to the change of the Ti3C2Tx MXene layer morphology from flat to curly and significantly improve the hydrophilicity and resistance. The curly flake structure constructs a fast channel for the entry and exit of water molecules which improves the hydration/dehydration efficiency of the material; the enhanced hydrophilicity of the material sharply reduces the resistance of the material after moisture absorption, which significantly improves the responsiveness of Ti3C2Tx MXene to humidity. The curly flake Ti3C2Tx MXene humidity sensor has an ultra-high sensitivity of S = 1.2 × 105 (two orders of magnitude higher than that of the reported humidity sensor based on MXene), with a fast response rate (2 s), good repeatability and stability (4 weeks), and it can be used for the analysis of human respiration rate, and also for non-contact sensing detection of the human body and environmental humidity detection.
研究领域:
材料科学
·
传感技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 35
·期 9
·2202193
·
IF 32.086
Longhao Zhang,Hao Yan,JiaJia Zhou,Ziguang Zhao,Jin Huang,Lie Chen,Yunfei Ru,Mingjie Liu
Current hydrogel actuators mostly suffer from weak actuation strength and low responsive speed owing to their solvent diffusion-induced volume change mechanism. Here a skeletal muscle-inspired organohydrogel actuator is reported in which solvents are confined in hydrophobic microdomains. Organohydrogel actuator is driven by compartmentalized directional network deformation instead of volume change, avoiding the limitations that originate from solvent diffusion. Organohydrogel actuator has an actuation frequency of 0.11 Hz, 110 times that of traditional solvent diffusion-driven hydrogel actuators (<10 −3 Hz), and can lift more than 85 times their own weight. This design achieves the combination of high responsive speed, high actuation strength, and large material size, proposing a strategy to fabricate hydrogel actuators comparable with skeletal muscle performance.
研究领域:
材料科学
·
生物医学工程
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Cancan Tian,Fei Wang,Yunpeng Wang,Zhe Yang,Xuejiao Chen,Jingjing Mei,Hongzhen Liu,Dongxu Zhao
Self-powered photodetectors (SPPDs) have attracted lots of attention due to their various advantages including no external power sources, high-sensitivity, fast response speed, and so on. This study reports the fabrication and characterization results of CsPbBr3 microcrystals (MCs) grown by chemical vapor deposition (CVD) method, and the SPPDs have been fabricated on the basis of the CsPbBr3 MCs layer with the sandwich structure of GaN/CsPbBr3 MCs/ZnO. Such designed SPPD shows the detectivity (D*) of 1014 Jones, on/off ratio of up to 105, peak responsivity (R) of 89.5 mA/W, and enhanced stability at the incident wavelength of 540 nm. The photodetector enables the fast photoresponse speed of 100 μs rise time and 140 μs decay time. The performances of the SPPD are comparable to the best ones ever reported for CsPbBr3 based PDs but do not need external power supplies, which mainly benefit from the low trap density, long carrier diffusion of high quality CsPbBr3MCs film, and the built-in electric fields in the sandwich structure of GaN/CsPbBr3/ZnO layers.
研究领域:
材料科学
·
光子学
·
纳米技术
·
半导体器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 20
·2300646
·
IF 9
Xinyi Zhang,Karim Khan,Ayesha Khan Tareen,Ye Zhang
Exploration of novel two–dimensional (2D) nanomaterials with desired properties using a controlled approach remains one of the major challenges ahead. Clusterphene, the newly emerged 2D formation of self-assembled clusters, exhibits a comparable structure to graphene with intriguing physicochemical features, which are applied in several scientific disciplines. Herein, it is demonstrated that polyoxometalate clusterphene (POMCene) is a promising 2D nanomaterial for photoelectrochemical (PEC) photodetection. The photodetection performance of POMCene can be subtly tuned by adjusting external conditions like bias voltage, electrolyte, and incident wavelength. A photocurrent of 1.88 µA cm ‒2 , a responsivity of 2.26 µA W ‒1 , a detectivity of 5.65 × 10 9 Jones, and a fast response speed of 0.02 s along with good long-term stability can be achieved. It is believed that this research can pave a new direction for the future development of 2D POMCene in high-performance optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Xicheng Lu,Xin Cui,Huanyu Tan,Jiaxue Hou,Xiaoqin Wang,Chunxia Hua,Jia Chu,Ming Gong,Shanxin Xiong,Bohua Wu
As a typical electrochromic material, WO 3 has been extensively studied due to its exceptional photoelectric properties. However, like most transition metal oxides, it suffers from intrinsic limitations, including low conductivity and slow response kinetics. Since conventional carbon quantum dots (CQDs) doping methods often alter the surface and internal structure of WO 3 films, this study employs an impregnation method to introduce CQDs into WO 3 films by post-treatment method, thereby avoiding the structural damage caused by traditional doping approaches. This method not only preserves the original microstructure of WO 3 but also significantly enhances the electrochromic performance (e.g., response speed, optical contrast, and cycling stability) by leveraging the high conductivity and unique optical properties of CQDs. This mild and efficient doping strategy offers new insights for optimizing the performance of other transition metal oxide materials. By precisely controlling the CQDs doping concentration (0.05 wt%), a high-performance WO 3 -CQDs-2 composite film was successfully fabricated. This film exhibits outstanding performance across multiple key metrics: a high areal charge capacity (39.8 mC cm −2 ), a remarkable optical modulation range (ΔT = 72.7 %), fast response times (2.3 s/3.4 s), and excellent cycling stability (retaining 93.2 % of initial performance after 2000 cycles). Additionally, the film's bandgap was narrowed by 0.21 eV, further confirming improved charge transport properties. This comprehensive performance enhancement provides a reliable material foundation for the practical application of electrochromic devices.
研究领域:
材料科学
·
纳米科技
·
电化学
·
功能材料
·
光电材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yunqing Li,Chunhong Chen,Yunxia Zhou,Xiong Li,Yingeng Wang,Bowen Li,Renyan Zhang,Xiangang Luo
Graphene-based electrochromic devices have garnered significant attention owing to their rapid response and broad band tunability. The performance of such devices is highly dependent on the thickness of the graphene film. However, the fabrication of uniform multilayer graphene films with desired thicknesses in the tens of nanometers via chemical vapor deposition remains challenging to date. In this study, reduced graphene oxide (rGO) membranes with tailored thicknesses were prepared using a vacuum filtration method, and the performance of electrochromic devices based on ionic liquid intercalation into these as-prepared rGO membranes was systematically investigated. It was found that the transmittance modulation depth (%) is dependent on the thickness of the rGO membranes, with the maximum value reaching 34.72% in a wavelength range of 0.45–1.10 μm, which corresponds to a membrane thickness of 32 nm. Through careful optimization of the preparation process, the devices exhibited enhanced switching speeds (typically, a charging time of 0.7 s and a discharging time of 0.2 s), which are faster than those reported for devices using graphitic films, and the underlying mechanism is proposed. Besides, the reflectance modulation depth reached 52.83% in a wavelength range of 2–16 μm. Our approach overcomes the existing limitations associated with the preparation of uniform multilayer graphene films with desired thicknesses for electrochromic applications using the chemical vapor deposition method. This work also holds great promise for the development of high-speed switching and flexible smart windows as well as for applications in dynamic optical camouflage.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
智能窗户
·
节能器件
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Hongtao Wang,Meng Dai,Yueyue Li,Jihao Bai,Yueying Liu,Yuan Li,Chenchang Wang,Fengmin Liu,Geyu Lu
Three different ZnO nanostructures (nanorods/flowers/spheres) were prepared through facile hydrothermal method or water bath, whose sensing properties to NO 2 were investigated in detail at room temperature activated by UV light (365 nm LED). The sensing results showed that ZnO nanospheres exhibit the highest response of 29.4–5 ppm NO 2 , which can be attributed to their biggest specific surface area and the most amount of adsorbed oxygen species on the surface. In contrast, ZnO nanorods show the fastest response and recovery speed (9 and 18 s to 5 ppm NO 2 , respectively) due to their highest crystallinity, least surface defects and unidirectional electron transfer path, which is much faster than most reported literatures. With regard to the ZnO nanoflowers, both the gas-sensing response and the response and recovery speed are between ZnO nanorods and ZnO nanospheres. Furthermore, the stability, selectivity, and the moisture resistance of three different ZnO nanostructures were also researched.
研究领域:
材料科学
·
环境监测
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Zhijuan Xu,Shisheng Lin,Xiaoqiang Li,Shengjiao Zhang,Zhiqian Wu,Wenli Xu,Yanghua Lu,Sen Xu
Two dimensional material/semiconductor heterostructures offer alternative platforms for optoelectronic devices other than conventional Schottky and p–n junction devices. Herein, we use MoS 2 /GaAs heterojunction as a self-driven photodetector with wide response band width from ultraviolet to visible light, which exhibits high sensitivity to the incident light of 635 nm with responsivity as 321 mA/W and detectivity as 3.5×10 13 Jones (Jones=cm Hz 1/2 W −1 ), respectively. Employing interface design by inserting h-BN and photo-induced doping by covering Si quantum dots on the device, the responsivity is increased to 419 mA/W for incident light of 635 nm. Distinctly, attributing to the low dark current of the MoS 2 /h-BN/GaAs sandwich structure based on the self-driven operation condition, the detectivity shows extremely high value of 1.9×10 14 Jones for incident light of 635 nm, which is higher than all the reported values of the MoS 2 based photodetectors. Further investigations reveal that the MoS 2 /GaAs based photodetectors have response speed with the typical rise/fall time as 17/31 μs. The photodetectors are stable while sealed with polymethyl methacrylate after storage in air for one month. These results imply that monolayer MoS 2 /GaAs heterojunction may have great potential for practical applications as high performance self-driven photodetectors.
研究领域:
材料科学
·
光电
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
ACS Energy Letters
·
2025
·
IF 18.2
Hongyang Li,Xiaopeng Zhang,Meimei Zhu,Dongwen Zou,Jingyan Liu,Meili Xu,Yaowu He,Hong Meng
All-solid-state electrochromic devices (ECDs) demonstrate significant potential for smart window applications through the voltage-regulated modulation of solar radiation transmittance. Current implementations remain constrained by insufficient optical contrast, resulting in suboptimal solar heat gain coefficients. In this study, we present a molecular engineering approach utilizing p-terphenyl to develop transparent-to-blank transmissive electrochromic polymers (ECPs) with enhanced optical performance, creating ECDs with decent optical contrast and switching speed. Structural modification through terphenyl incorporation induces substantial bandgap enlargement in the polymeric system, thereby enhancing optical transparency in the neutral state. The optimized PTPA-TP derivatives exhibit superior performance characteristics, achieving an integrated optical contrast ratio of 88.2% across the visible spectrum with peak modulation of 90.6% at 508 nm. Notably, the device demonstrates exceptional switching kinetics with coloration and bleaching times of 1.6 and 2.0 s, respectively, resulting from expanded interplanar spacing that facilitates efficient ion transport. In simulations assessing building energy savings, the PTPA-TP smart window is projected to save between 9.8% and 16.6% of the total annual energy in nine cities with diverse climates, with a notable saving of 5.97 kWh per year in Xiamen. These findings underscore the potential for PTPA-TP as a promising candidate for next-generation electrochromic smart windows, paving the way for energy-efficient and sustainable building designs.
研究领域:
材料科学
·
电化学
·
建筑技术
·
光学
·
能源效率
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiao Wang,Zhulu Song,Haodong Tang,Yiwen Li,Huaying Zhong,Jiufeng Wu,Weichao Wang,Simin Chen,Wenjie Zhang,Fan Fang,Junjie Hao,Dan Wu,Peter Müller-Buschbaum,Leifeng Cao,Zeguo Tang,Jun Tang,Lei Zhang,Kai Wang,Wei Chen
PbS quantum dots (QDs) are promising for short-wave infrared (SWIR) photodetection and imaging. Solid-state ligand exchange (SSLE) is a low-fabrication-threshold QD solid fabrication method. However, QD treatment by SSLE remains challenging in seeking refined surface passivation to achieve the desired device performance. This work investigates using NaAc in the ligand exchange process to enhance the film morphology and electronic coupling configuration of QD solids. By implementing various film and photodetector device characterization studies, we confirm that adding NaAc with a prominent adding ratio of 20 wt % NaAc with tetrabutylammonium iodide (TBAI) in the SSLE leads to an improved film morphology, reduced surface roughness, and decreased trap states in the QD solid films. Moreover, compared to the devices without NaAc treatment, those fabricated with NaAc-treated QD solids exhibit an enhanced performance, including lower dark current density (<100 nA/cm2), faster response speed, higher responsivity, detectivity, and external quantum efficiency (EQE reaching 25%). The discoveries can be insightful in developing efficient, low-cost, and low-fabrication-threshold QD SWIR detection and imager applications.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 17
·1355
·
IF 4.3
Gengcheng Liao,Sichao Yu,Jiebo Zeng,Zongyu Huang,Xiang Qi,Jianxin Zhong,Long Ren
In this paper, we design a self-powered photoelectrochemical (PEC)-type photodetector based on a hybridization of two-dimensional (2D) few-layer antimony (Sb) nanosheets (NSs) and reduced graphene oxide (rGO). The few-layer Sb NSs obtained by liquid-phase exfoliation can be anchored on the surface of rGO through hydrothermal treatment. Specifically, during photoexcitation, the electron–hole pairs photogenerated on the surface of Sb NSs can be well stimulated and transferred by rGO, reducing the photogenerated carriers recombine on Sb NSs. The excellent electrochemical performance is confirmed by PEC tests. The photobehavior performance of the Sb NSs-rGO composite is significantly improved; its photocurrent density reaches 48.830 nA/cm2at zero potential, approximately twice that of pure Sb NSs. The hybrid exhibits a faster photoresponse speed, with the response time and recovery time being 0.140 s and 0.163 s, respectively. This enhancement arises from the conductive role of rGO as a conductive channel, and as a result, the efficient separation of photoinduced electron–hole pairs is facilitated. This study is a further exploration of hybrid engineering of 2D materials in photochemical photodetectors and demonstrates significant progress in this field.
研究领域:
材料科学
·
纳米技术
·
光电化学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）