POLYMER COMPOSITES
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2025
·
IF 4.7
Zhenbang Zhang,Fahu Yang,Guangming Li,Jiahong Xiang,Yifan Zhong,Haili Zhao,Tao Chen,Guo Li
The poly-(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS), single-walled carbon nanotubes (SWCNTs), and polyethylene glycol (PEO) were composited and subsequently spin-coated on a Polydimethylsiloxane (PDMS) substrate to prepare a stretchable and flexible bilayer film, and the electrical resistance of the film was adjusted to be unchanged by the pre-stretching processing. The interpenetrating structure was formed within the PEDOT:PSS/SWCNTs/PEO film when the PEO concentration was 5 wt%. The PEDOT:PSS and SWCNTs served as the electric phase forming the conductive path, while the PEO acted as the elastic phase, thereby enabling the film to exhibit stretchability, flexibility, and high conductivity. The pre-stretching processing, which consisted of sequential uniaxial stretching and relaxation, resulted in wrinkling of the PEDOT:PSS/SWCNTs/PEO film due to the stretching strain exceeding the elastic deformation limit. The transmittance changes of the films subjected to the pre-stretching processing also proved that the wrinkles were formed. The film, comprising 5 wt% PEO and 10 wt% SWCNTs, exhibited a minimum sheet resistance of 43 Ω/sq. without pre-stretching and demonstrated stable electrical resistance when subjected to pre-stretching processing with 50% strain. The bilayer film with pre-stretching processing had achieved a comparable level of performance to that of contemporary medical electrodes for electrocardiogram detection. Meanwhile, the bilayer film without pre-stretching could be utilized as a strain sensor for monitoring body motion. Highlights Stretchable and flexible PEDOT:PSS/SWCNTs/PEO films were prepared. The interpenetrating structure of PEDOT:PSS/SWCNTs/PEO films was constructed using scanning electron microscopy and Fourier transfer infrared spectra. Pre-stretching processing could produce wrinkled structure on the surface of the bilayer film. The wrinkled structure makes the film exhibit electrical resistance stability.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 42
·25186-25199
·
IF 3.119
Qing Kong,Hang Xu,ChenWei Liu,Guang Yang,Mingmei Ding,Wen Yang,Tao Lin,Wei Chen,Stephen Gray,Zongli Xie
A high-flux thin film nanocomposite (TFN) nanofiltration (NF) membrane for low pressure operation (3.5 bar) was fabricated by blending purified amino-functionalized single-walled carbon nanotubes (NH2-SWCNTs) with piperazine (PIP) as aqueous phase monomers through interfacial polymerization (IP). The surface properties and structures of the polyamide (PA) active layer were suitably tailored by introducing different amounts of NH2-SWCNTs into the PA layer. It was found that the homogeneous incorporation of NH2-SWCNTs facilitated a more integral PA layer along with improved roughness, hydrophilicity, and surface charge of the modified membranes, which could be validated by membrane characterisation including SEM, AFM, ATR-FTIR, XPS, zeta potential and water contact angle measurements. Based on cross-flow NF tests, the optimized ultra-thin NH2-SWCNT-TFN membranes with 0.002 wt% of NH2-SWCNTs exhibited outstanding water permeability of up to 17.8 L m−2 h−1 bar−1, 71.1% higher than that of the pristine membrane, along with high MgSO4 rejection of 91.0% and Na2SO4 rejection of 96.34%. Meanwhile, NH2-SWCNT-TFN membranes also showed excellent long-term stability and antifouling ability. This work demonstrates a facile strategy to fabricate a scalable, low-pressure and ultra-thin TFN membrane with excellent performance.
研究领域:
材料科学
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环境工程
·
化学工程
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产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·
IF 15.7
Yao Yuan,Zhang Xinyue,Cao Yingying,Liu Long,Zhang Yanqiang,Zhang Suojiang
Cyclopropane-based aerospace fuels exhibit the excellent volumetric calorific value, leading to broad application prospects in aircrafts. However, due to the highly rigid structure of the cyclopropane (compared to cyclobutane or cyclopentane, etc.) and the difficulty in forming metal-carbene intermediates, there are still significant challenges in the precise synthesis of multi-cyclopropane-based high-energy fuels ( ≥ 2 cyclopropane structures). Herein, via the introduction of bending strain on metal organic complex, we report a single-site Cu/single-walled carbon nanotube catalyst (Cu/SWCNT), which possesses 2.6-fold conversion (up to 77.4%) and 4-fold selectivity (up to 45.7%) as that without bending strain for the preparation of bi-cyclopropane-based fuels from dienes. XAFS and DFT calculations show that bending strain enhances the upward shift of d-band center of β electrons (−4.370 to −4.366), thus promotes the adsorption and activation of CH 2 N 2 and alkenes. Moreover, bending strain elongates Cu-O bonds (1.91 to 1.96 Å), making it easier for CH 2 N 2 to insert and form Fischer carbene intermediates. These two aspects obviously reduce the reaction energy barrier from 40.3 to 33.7 kcal·mol -1 for the cyclopropanation process. Our work provides a method of strain engineering to regulate C-C coupling reactions at the molecular level, and achieve highly efficient cyclopropanation from alkenes.
研究领域:
催化
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材料科学
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有机合成
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纳米技术
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能源化学
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产品关联
DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2020
·Vol. 5
·期 9
·2000288
·
IF 5.969
Ruisi Chen,Junhui Tang,Yajie Yan,Ziqi Liang
Carbon nanotubes (CNTs) have been demonstrated as promising candidates for thermoelectrics (TEs) owing to their excellent electrical and mechanical properties. Here a new dopant to obtain flexible n-type CNT-based TE films from solution is reported. By doping single-walled carbon nanotubes (SWCNTs) with tetrabutylammonium bromide (TBAB), p-type nanotubes can be successfully converted to n-type form, which is confirmed by both Raman and X-ray photoemission spectroscopy (XPS) spectra. Furthermore, the influences of doping concentration and dispersion medium on TE properties are investigated. The optimal n-type SWCNT films fabricated in N , N -dimethylformamide (DMF) solvent exhibit an impressive power factor of 339 µW m −1 K −2 and excellent air stability by less than 10% variation of Seebeck coefficient during 192 h at room temperature without encapsulation, both of which are among the hitherto highest reported. This work sheds light on the interaction between TBAB molecules and SWCNTs in different dispersion media and offers a guideline for efficient n-doping of SWCNT based TE materials.
研究领域:
材料科学
·
物理化学
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产品关联
DOI
高影响因子
INFRARED PHYSICS & TECHNOLOGY
·
2022
·
IF 2.997
Shaowen Chu,Dalin Sun,Jiaqi Chen,Lang Sun,Wentao Shi,Juan Lu,Xintong Xu,Shuangchen Ruan
An all-fiberized, mode-locked thulium-doped laser was demonstrated using single-walled carbon nanotubes (SWCNTs) as the saturable absorber (SA). These SWCNTs were prepared by pyrolyzing tripropylamine confined in the one-dimensional nanochannels of zeolite ZnAPO-5 (AFI) single crystal and then the SWCNTs@AFI SA was transferred onto the end face of fiber connector. By inserting the SA into the fiber laser cavity, stable mode-locked solitons with 810 fs pulse width, 14.12 MHz repetition rate centered at 1913.6 nm was generated, the laser output showed the long-term stability and high signal-to-noise ratio. The experimental results confirmed that the SWCNTs@AFI could be an effective candidate as saturable absorption material for passively generating ultrafast pulses in 2 μm laser systems. This is, to the best of our knowledge, the first demonstration of SWCNTs@AFI SA in fiber lasers at 2 μm.
研究领域:
光学
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材料科学
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激光技术
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DOI
高影响因子
Small
·
2024
·
IF 13
Lin Zhang,Hongjing Shang,Qi Zou,Changping Feng,Hongwei Gu,Fazhu Ding
Flexible polymer/single-wall carbon nanotube (SWCNT) composites are a vital component for wearable/portable electronics, but the development of their n-type counterpart is laggard. Furthermore, little attention is paid to the interaction between SWCNT and polymers, especially the unconjugated polymers, as well as the conversion mechanism of conduction characteristics. Here, the n-type flexible SWCNTs/Polyvinyl Pyrrolidone (PVP) films are successfully fabricated, where the oxygen atoms in PVP interacted with SWCNT via hydrogen bonds, which can lower the energy barrier of electron tunneling, providing the pathway for the electron transfer. Furthermore, with the increasing synthesis temperature, the hydrogen bonds strengthened and the thermal activation energy further improved, both of which enhanced the electron-donating ability of PVP, resulting in a high-power-factor value of 260 µW m −1 K −2 . Based on the optimized SWCNTs/PVP films, a thermoelectric module is assembled, which achieved a power density of 400 µW cm −2 at a temperature difference of 56 K, coupled with excellent flexibility, showing a less than 1% variation of resistance after 5000 bending cycles. It shows the highest output-performance and the best flexibility among the reported SWCNT-based thermoelectric modules. This work provides significant insights into the interaction mechanism and performance optimization of hybrid thermoelectric composites, based on SWCNTs/unconjugated polymers.
研究领域:
材料科学
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纳米技术
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能源材料
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Xinxing Zhou,Yujie Lin,Bo Wu,Hujing Shu,Kerui Li,Qinghong Zhang,Yaogang Li,Chengyi Hou,Hongzhi Wang
The decoupling of thermoelectric performance parameters to coordinately optimize power factor (PF) and figure of merit (ZT) remains a critical challenge. Aerogels are valued for their low thermal conductivity and light weight; however, the lower electrical properties also lead to poor ZT values that affect their practical use. Herein, we implement a directional assembly strategy integrating Te nanowires (Te NWs) with single-walled carbon nanotubes (SWCNTs) to construct a three-dimensional interwoven network. Mechanistic analysis reveals that enhanced carrier mobility and optimized phonon scattering constitute two pivotal factors. The aerogel achieves PF and ZT of 179.61 μW m −1 K −2 and 0.27, respectively, while maintaining its low thermal conductivity. These parameters rank among the highest reported values for thermoelectric aerogels, accompanied by well-preserved compressibility of 30 %. A wrist-worn flexible device with 12 aerogel units generates 30.84 mV open-circuit voltage and 2.79 μW power output under 45 K temperature difference, demonstrating application potential.
研究领域:
材料科学
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纳米技术
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热电材料
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能量转换
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柔性电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Qin-Xue Hu,Wei-Di Liu,Li Zhang,Wei Sun,Han Gao,Xiao-Lei Shi,Yan-Ling Yang,Qingfeng Liu,Zhi-Gang Chen
High power factor contributes high power generation output while high bending resistance extends the service life in flexible thermoelectric device. Here, we report an in situ grown 10 mol% single-walled carbon nanotubes (SWCNTs) and Ag 2+y Se (named as 10 mol% SWCNTs/Ag 2+y Se) film, which shows a high power factor of 19.36 μWcm −1 K −2 at 300 K and excellent bending resistance. Such a high power factor is attributed to the enhanced carrier concentration and enlarged effective mass, induced by the additional interstitial Ag in the in situ grown Ag 2 Se on SWCNTs . Moreover, the 10 mol% SWCNTs/Ag 2+y Se film can remain 95 % of the initial electrical conductivity after 1000 bending cycles at the radius of 5 mm, indicating an excellent bending resistance. In addition, this film was assembled into a flexible thermoelectric power generator, which can achieve an output power of 0.72 μW and an open-circuit voltage of 18.17 mV at a temperature difference of 30 K. This study indicates that in situ compositing Ag 2 Se on SWCNTs can realize the increased thermoelectric performance and bending resistance, which drives the application of Ag 2 Se-based flexible films.
研究领域:
材料科学
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热电学
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纳米技术
·
柔性电子
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产品关联
DOI
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Renjie Chen,Xinyu Huang,Weibin Deng,Ruizhi Zheng,Waseem Aftab,Jinmin Shi,Delong Xie,Ruqiang Zou,Yi Mei
Carbon nanotubes (CNTs) based phase change composites have been widely reported to be used in areas related to energy conversion and storage . However, these bulk-like materials are not convenient for the further applications. Herein, we introduce the preparation of electrically conductive CNT/polymer films into the fabrication of conductive PCM films. The stable single wall carbon nanotube (SWCNT) dispersion was prepared by ultrasonic treatment with the help of surfactant. The SWCNT hydrogel was prepared by the addition of CaCl 2 (aq.) via colloid aggregation (diffusion-limited cluster aggregation). Eicosane was infiltrated into the SWCNT skeleton by diffusion after solvent replacement, and the flexible phase change film (PCMF) was easily obtained by volatilization synchronously. According to the SEM images, eicosane was encapsulated in the SWCNT scaffolding. And PCMF exhibited a promising conductivity, flexibility, thermal stability and reversibility during the heat storage and release processes. For example, when the SWCNT ratio was 27.1%, the latent heat and conductivity were 204.8 J/g and 620.3 S/m, respectively. The results of 200 repeated melting and freezing cycles revealed that the sample have stable latent heat performance. The eicosane/SWCNT films could store thermal energy at modulated input voltage, which could be applied by conventional batteries . And the highest energy storage efficiency of samples was up to 91.3%. These flexible electro-driven films have wide prospect in smart electronic device, small scale heater, infrared stealth, wearable devices , etc.
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
Surfaces and Interfaces
·
2025
·
IF 6.3
Hao-Kai Lou,Peng-Fei Qian,Ze-Long Bao,Zhi-Liang Liu,Cheng-Yu Liu,Yu-Long Guo,Tian-Li Wang,Chun-Hao Chang,Wen-Hao Geng,Hong-Zhang Geng
Flexible and transparent conductive films are extensively employed in window defogging, wearable physiotherapy devices, transparent electrodes, electromagnetic interference shielding, flexible displays, etc. Though silver nanowires (AgNWs) and low-dimensional carbons (e.g., CNTs) and Ti₃C₂Tₓ MXene accelerate field development, persistent challenges such as CNTs dispersion instability and AgNWs oxidation susceptibility limit practical implementation. This study designed a multilayer composite film on PET: a cross-network conductive layer of AgNWs and citric acid-modified single-walled carbon nanotubes (CA-SWCNTs), encapsulated by an aluminum-doped zinc oxide (AZO) protective layer via sol-gel method. AgNWs with high aspect ratio (average diameter 74 nm, length 53 μm) were synthesized by polyol method as the conductive backbone. CA-SWCNTs enhanced hydrophilicity and interfacial bonding, forming a stable conductive/thermal network. By suppressing oxidation and reflection, the AZO encapsulation layer increased the transmittance at 550 nm from 81.3 % to 82.1 % while maintaining a low sheet resistance of 5.4 Ω/sq. The composite films delivered an EMI shielding efficiency of 28.9 dB (8.2 GHz), achieved rapid Joule heating to 120 °C within 90 s at 7 V, demonstrated robust stability over 5500 s of cyclic operation, and exhibited environmental endurance with merely 19.9 % sheet resistance increase after 480 h air exposure as well as a 22.1 % increase after 100 cycles of tape peeling tests. This work provides an innovative strategy for multifunctional flexible transparent devices.
研究领域:
材料科学
·
纳米技术
·
柔性电子学
·
电磁干扰屏蔽
·
能量转换与热管理
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Fuxian Cai,Qinghua Wang,Xiaoqian Chen,Weiwei Qiu,Fengping Zhan,Fei Gao,Qingxiang Wang
A nanocomposite of flake-shaped manganese-terephthalic acid MOF/single-walled carbon nanotubes (Mn(TPA)-SWCNTs) was synthesized using manganese chloride, terephthalic acid and SWCNTs as raw materials. Theoretical modeling study shows that the Mn(TPA) component has stronger adsorption ability to lead ion (Pb 2+ ) than the other common heavy metal ions , which is in good agreement with the result of electrochemical assay. Then, the Mn(TPA)-SWCNTs were used as a sensing matrix for the voltammetric determination of Pb 2+ . The results displayed that the sensor shows high analytical performance for Pb 2+ due to the synergy of Mn(TPA) with highly selective binding to Pb 2+ and SWCNTs with high electronic conductivity . Under the optimal conditions, the Mn(TPA)-SWCNTs-based electrochemical sensor presented a wide linear response over the concentration range from 0.10 to 14.0 μM. The limit of detection was achieved to be 38 nM. Satisfactory results were also achieved when the Mn(TPA)-SWCNTs-based sensor was utilized for the determination of Pb 2+ in the practical samples of industrial wastewater and human serum, suggesting great promising of the sensor for practical application.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xin Xu,Fengxing Jiang,Xiaofang Liu,Cheng Liu,Congcong Liu,Qinglin Jiang,Haixin Ding,Jingkun Xu,Peipei Liu
The development of freestanding electrodes with high energy density remains a key challenge for potassium-ion supercapacitors. Herein, a supramolecular strategy is presented through the in situ electropolymerization of dibenzo-18-crown-6 (DB18C6) on single-walled carbon nanotubes (SWCNTs) films, fabricating the flexible poly(DB18C6) (PDB18C6)/SWCNTs hybrid electrodes. This design leverages dual charge-storage mechanisms: a conductive SWCNTs network for rapid electron transport and embedded PDB18C6 macrocycles for reversible K + coordination via host-guest interactions, which significantly enhances pseudocapacitance and cycling stability of the prepared film. By optimizing the electropolymerization time, the freestanding electrode achieves a high energy density of 77 Wh kg -1 at a power density of 1595 W kg -1 within an expansive operating window of -1.5 to 1.5 V. Notably, a high capacitance retention of 99.25% is maintained after 15,000 cycles at 10 A g -1 , attributable to the robust K + -crown ether coordination effect. Furthermore, a symmetrical supercapacitor assembled with PDB18C6/SWCNTs electrodes delivers an energy density of 18.75 Wh kg -1 at 1350 W kg -1 . This work underscores the promise of supramolecular coordination chemistry for designing high-performance energy storage devices.
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产品关联
DOI
高影响因子
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