Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
Energy Material Advances
·
2024
·
IF 14.8
Xin Wu,Peiyao Liu,Bingchen Huo,Yiyang Li,Shuang Liu,Yifan Lv,Cun-Yue Guo
Organic thermoelectric materials are not only used in low-grade waste heat recovery but also have frontier applications in sensors, wearable self-powered devices, biomaterials, and smart materials with the development of flexible electronics. However, investigation on the thermoelectric performance of single-walled carbon nanotubes (SWCNTs) comparable to that of conducting polymers and their composites with SWCNTs has been rarely attempted, and there were few reports on SWCNTs alone as organic thermoelectric materials. Certainly, SWCNTs possess high Young’s modulus, high thermal stability, flexibility, lightweight, easily controllable doping level, and facile p–n transition, while the mechanism of molecular doping of SWCNTs remains to be well understood. Here, facile solution processing achieved the enhancement of p-type and n-type thermoelectric performance of SWCNTs. Small-molecular-weight polyethylene glycol treatment improved electrical conductivity and the Seebeck coefficient of SWCNTs (p-SWCNTs) simultaneously, with the power factor of 303.17 ± 46.25 μW·m−1·K−2. Small amount of polyethylenimine doping made the Seebeck coefficient of SWCNTs (n-SWCNTs) turn negative and rendered great air stability of n-SWCNTs. The electrical conductivity and power factor of n-SWCNTs reached 1,702.56 ± 164.13 S·cm−1 and 418.49 ± 46.30 μW·m−1·K−2 at 298 K, respectively. The power factor of n-SWCNTs got even higher at 319.5 K in vacuo, reaching a high value of 643.35 μW·m−1·K−2. Finally, mechanism study in this work provided inspiration and guidance for the application of these types of dopants in the performance improvement of SWCNTs.
研究领域:
材料科学
·
有机电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zhengchang Xia,Ji Jiang,Aoxing Wang,Di An,Zhouxin Li,Huaiwen Zheng,Zhigang Yin,Gufeng He,Jingbi You,Xingwang Zhang
Metal halide perovskites hold great promise for display technologies owing to their excellent optoelectronic properties. Recent advances in perovskite light-emitting diodes (PeLEDs) have improved their efficiency, brightness, and operational stability, but simultaneously boosting these metrics remains challenging. Additionally, other critical metrics such as power consumption, color purity, and gamut have received little attention. Here, a co-additive approach is proposed to regulate the perovskite crystallization, enabling the synthesis of CsPbBr 3 &Cs 4 PbBr 6 dual-phase nanocrystals (NCs) and the formation of nanoscale concave-convex morphology, as well as to change its semiconductor polarity by molecular doping. Due to the reduced defect density, balanced charge injection, and improved light extraction efficiency, the PeLEDs achieve a remarkable external quantum efficiency (EQE) of 28.2%, a high brightness of over 150000 cd m −2 and a T 50 lifetime of 4291 h, along with an ultra-narrow spectral linewidth (16.5 nm), an ultra-low driving voltage (1.9 V), and a superior Rec. 2020 color gamut coverage (CGC) of 92%.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
·
2022
·
IF 11.307
Haojie Li,Qiang Zhang,Zhixuan Xie,Bingyu Zhao,Yuxiu Yu,Yaodong Liu
Simultaneously enhancing the gas permeability , selectivity and aging stability of carbon molecular sieve membrane (CMSM) is extremely difficult. Facing such poser, a novel silicon doped CMSM at molecular level was prepared by copolymerizing siloxane with single Si– O –Si unit into the backbone of polyimide (PI). This can effectively avoid prior separated structure or multiple Si– O –Si structures and strongly alter the chains packing and thermostability of PI, finally determine the pore structure and thermodynamic behavior . The simple design adjustment simultaneously exhibits the triple enhanced effects on the gas permeability, selectivity and aging stability. The best molecule doped CMSM exhibits the ultra-high H 2 permeability (12482 Barrer, 87% higher), 26% higher H 2 /CH 4 selectivity, and 32% higher H 2 /N 2 selectivity than pure PI based CMSM. Additionally, such CMSM also has a much better aging stability than pure CMSM and most reported CMSMs . After stabilization, it still maintains a high H 2 permeability (8000 Barrer). And the hyper-aging CMSM also exhibits a good aging resistance showing a H 2 permeability of 5300 Barrer, as well as high selectivity of H 2 /CH 4 (125) and H 2 /N 2 (106) after 35 days. This work opens a new way on designing CMSM with excellent performance through heteroatom doping to need future application.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Menghong Li,Ting Tian,Xiaoqiang Yang,Yulong He,Dashan Zhang,Peter Müller-Buschbaum,Shubin Yang,Bin Li
Solid polymer electrolytes (SPEs) based on polyvinylidene fluoride (PVDF) are promising candidates due to their outstanding mechanical properties and intrinsic safety features. Unfortunately, the crystalline α phase of PVDF limits the mobility of lithium ions, thus leading to low lithium ion conductivity. Herein, a molecular doping strategy is proposed to achieve high lithium ion conductivity of the PVDF-based electrolyte (md-PVDF) via introducing polyvinylidene dichloride (PVDC) to reduce the generation of the harmful α phase of PVDF. As the molecular analog of PVDF, PVDC is homogeneously dispersed in PVDF at arbitrary concentrations, and it disrupts the crystallization of the PVDF matrix. Moreover, the chlorine functional group in doping molecular PVDC not only enhances the dissociation of Li salt but also reduces the energy barrier of lithium-ion migration. Consequently, the resulting md-PVDF electrolytes show significantly high ionic conductivity (1.4 × 10–3 S cm–1 at room temperature). The lithium symmetric batteries with md-PVDF electrolytes cycle stably for over 2000 h at 0.1 mA cm–2, and the Li||LFP batteries display excellent cycling stability over 500 cycles at a high rate of 5 C. In addition, the md-PVDF electrolytes exhibit outstanding low-temperature performance, achieving an ionic conductivity of 3.0 × 10–4 S cm–1 at −5 °C. This work demonstrates a strategy to improve the ionic conductivity of SPEs and to realize fast charging of solid-state lithium.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Guowei Wang,Shuang Fu,Peng Hou,Yuedong Li,Chunxue Cui,Tonghui Yi,Hongguang Zhang
Utilizing solar energy for photodegradation of organic contaminants is an attractive strategy for environmental remediation. However, the synthesis of photocatalysts for efficient use of solar energy remains a challenge. Herein, we designed and synthesized a hierarchical and porous g-C 3 N 4 (CN) via thermal polymerization of 5-amino-1H-tetrazole (ATZ) and melamine molecules. Experimental results demonstrate that the incorporation of electron-deficient ATZ into the CN structure drastically promotes the separation and transport of photoexcited charge carriers, and increases the specific surface area and pore size of the sample. Based on these unique features, the optimal CN-ATZ1 sample exhibited excellent photocatalytic activity with a rate constant of 0.091 min −1 for the degradation of rhodamine B (RhB) under visible light irradiation, which was about 10.71 times higher than that of bulk CN. Radical trapping experiments demonstrate that the superoxide radical (•O 2 − ) is the major active species during the photodegradation process. This study provides a feasible strategy for the design and construction of g-C 3 N 4 photocatalysts with high degradation activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mingjun Qiu,Weiwei Du,Xinyu Luo,Siyuan Zhu,Yingwu Luo,Junjie Zhao
Incorporating inorganic components in organosiloxane polymer thin films for enhanced mechanical properties could enable better durability and longevity of functional coatings for a multitude of applications. However, molecularly dispersing the inorganic dopants while preserving the cyclosiloxane rings represents a challenge for cross-linked organosiloxane networks. Here, we report a molecular doping strategy using vapor-phase infiltration. On the basis of the proper Lewis acid–base interaction between diethyl zinc (DEZ) and cyclotrisiloxane rings, we achieved a complete infiltration of the organometallic precursors and well-distributed Zn–OH terminal groups formed in the initiated chemical vapor deposited poly(1,3,5-trimethyl-1,3,5-trivinylcyclotrisiloxane) (PV3D3) films. X-ray photoelectron spectroscopy and nanoscale infrared spectroscopy together with density functional theory simulation reveal that the formation of a Lewis acid–base adduct rather than a ring-opening process is possibly involved in anchoring DEZ in the cross-linked network of PV3D3. Because of the incorporation of Zn–OH components, the organic–inorganic hybrid films obtained via our vapor-phase molecular doping exhibit a 10.2% larger elastic modulus and 67.0% higher hardness than the pristine PV3D3. Unveiling the reaction mechanisms between organometallic precursors and cross-linked organic networks provides new insights for expanding the vapor-phase processing strategies for engineering hybrid materials at the nanoscale.
研究领域:
材料科学
·
化学工程
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Cong Li,Ruizeng Luo,Yuan Bai,Jiajia Shao,Jianying Ji,Engui Wang,Zhe Li,Hongyu Meng,Zhou Li
Biodegradable polymers (BPs)-based triboelectric nanogenerators (TENGs) have advantages, including biocompatibility and biodegradability. However, biodegradable TENGs (BD-TENGs) possess relatively low output performance, limiting their application due to the small differences in triboelectric polarities for most BPs. Molecular doping is a simple and effective method in altering the triboelectric polarity of triboelectric materials and improving the output performance of BD-TENGs. However, there is a lack of laws and mechanism about the differences in triboelectric polarities of different doped molecules, especially of molecules with biodegradability and biocompatibility. Here, kinds of doping molecules are selected for doping in tribopositive and tribonegative materials, respectively, and their triboelectric polarities and related laws are researched. In particular, the output performance of BD-TENG is improved several times by doping small amounts of poly (propylene glycol) (PPG) and ethyl cellulose (EC), with enhanced resolution in abnormal respiratory signal monitoring. This work not only provides theoretical guidance for the selection of triboelectric molecules but also conducts in-depth research in molecular-level triboelectric mechanisms.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 20
·期 19
·2308778
·
IF 13.3
Jiawen Yu,Rongtai Wan,Fajuan Tian,Jie Cao,Wen Wang,Qi Liu,Hanjun Yang,Jingcheng Liu,Ximei Liu,Tao Lin,Jingkun Xu,Baoyang Lu
Electrical bioadhesive interface (EBI), especially conducting polymer hydrogel (CPH)-based EBI, exhibits promising potential applications in various fields, including biomedical devices, neural interfaces, and wearable devices. However, current fabrication techniques of CPH-based EBI mostly focus on conventional methods such as direct casting, injection, and molding, which remains a lingering challenge for further pushing them toward customized practical bioelectronic applications and commercialization. Herein, 3D printable high-performance CPH-based EBI precursor inks are developed through composite engineering of PEDOT:PSS and adhesive ionic macromolecular dopants within tough hydrogel matrices (PVA). Such inks allow the facile fabrication of high-resolution and programmable patterned EBI through 3D printing. Upon successive freeze-thawing, the as-printed PEDOT:PSS-based EBI simultaneously exhibits high conductivity of 1.2 S m −1 , low interfacial impedance of 20 Ω, high stretchability of 349%, superior toughness of 109 kJ m −3 , and satisfactory adhesion to various materials. Enabled by these advantageous properties and excellent printability, the facile and continuous manufacturing of EBI-based skin electrodes is further demonstrated via 3D printing, and the fabricated electrodes display excellent ECG and EMG signal recording capability superior to commercial products. This work may provide a new avenue for rational design and fabrication of next-generation EBI for soft bioelectronics, further advancing seamless human-machine integration.
研究领域:
生物医学工程
·
材料科学
·
软体机器人
·
神经科学
·
可穿戴技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）