Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 7
·2381-2387
·
IF 7.059
Yihui Huang,Weiling Luan,Mengke Liu,Lyudmila Turyanska
All-inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, I) nanocrystals (NCs) have attracted considerable attention due to their tunable optical properties and high optical quantum yield. However, their stability in various environments, such as different solvents, high temperature and UV light, remains to be addressed to enable their exploitation in devices. Here, we report on the synthesis of all inorganic CsPbI3 perovskite nanocrystals capped with didodecyldimethylammonium bromide (DDAB). Monodispersed DDAB-capped CsPbI3 NCs have enhanced stability with respect to their morphological and optical properties compared to conventional oleic acid (OA)/oleylamine (OLA) capped nanocrystals. The DDAB-CsPbI3 NCs retain an optical quantum yield >80% for at least 60 days. The enhanced stability is explained by the binding of branched DDAB ligands to the NC surface, leading to the formation of a halogen-rich surface, as confirmed by X-ray photoelectron spectroscopy, with an iodine to lead atomic ratio of I : Pb = 4 : 1. These perovskites were used in light-emitting diodes (LEDs) and have a maximum external quantum efficiency (EQE) of 1.25% and a luminance of 468 cd m−2, and demonstrated improved operational performance. The enhanced stability of DDAB-CsPbI3 in the environments relevant for device processing and operation is relevant for their exploitation in optoelectronics.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 7
·656-664
·
IF 0
Dong Yan,Wang Lu,Nie Fei,Zheng Jianbin
A novel polypyrrole-fullerene-didodecyldimethylammonium bromide (PPy-C60-DDAB) was synthesized by an in situ chemical oxidative polymerization method. Scanning electron microscopy (SEM) study showed the morphologies of the nanocomposites. The direct electrochemistry
of hemoglobin (Hb) immobilized on the designed PPy-C60-DDAB composite film modified carbon ionic liquid electrode (Nafion/Hb/PPy-C60-DDAB/CILE) and its biosensing for hydrogen peroxide (H2O2) were investigated. The results indicated that direct electron
transfer of Hb was realized on the underlying electrode with the usage of the PPy-C60-DDAB nanocomposite film. Moreover, the Nafion/Hb/PPy-C60-DDAB/CILE based sensor showed prominent electrocatalytic activity for the detection of H2O2. The current
response was linearly related to the H2O2 concentration in the range from 1 to 114 μM, with a sensitivity of 936 μA mM–1 cm–2 and a second range from 114 to 1479 μM with a sensitivity of 299 μA
mM–1 cm–2. The detection limit was 0.3 μM at a signal-to-noise ratio of 3. Thus the PPy-C60-DDAB composite provided by simple synthesis technique will have potential application in studying the electron transfer of enzyme and the design
of novel electrochemical biosensors.
研究领域:
材料科学
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电化学
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纳米技术
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生物传感器
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分析化学
✓ 已验证
DOI
RSC Advances
·
2017
·Vol. 7
·期 29
·17633-17639
·
IF 3.108
Fei Zheng,Xiao-Yu Yang,Peng-Qing Bi,Meng-Si Niu,Cheng-Kun Lv,Lin Feng,Xiao-Tao Hao,Kenneth P. Ghiggino
2-Chlorophenyl isocyanate (CI) reacts with didodecyl dimethyl ammonium bromide (DDAB) functionalized graphene oxide (DDAB-GO) dispersed in ortho-dichlorobenzene under mild conditions. The CI treatment complements DDAB functionalization to further decrease the hydrophilicity of pristine GO sheets. The resulting CI–DDAB-GO exhibits improved compatibility with the conjugated polymer poly(3-hexylthiophene) (P3HT), compared to DDAB-GO. CI–DDAB-GO sheets can be homogeneously dispersed when blended with P3HT, resulting in an improved morphology compared to P3HT:DDAB-GO composites. The incorporation of CI–DDAB-GO can effectively reduce the dark current of photo-diodes based on P3HT composites, showing potential to enhance the performance of electronic devices based on conjugated polymer composites.
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 Applied Energy Materials
·
2021
·
IF 6.024
Juanmei Liu,Jihuai Wu,Weihai Sun,Xiaobing Wang,Yitian Du,Guodong Li,Qi Chen,Fangfang Cai,Sijia Zhu,Zhang Lan
One of the important components of perovskite solar cells (PSCs) is the hole transport layer (HTL), and the carrier transportation and moisture stability are confronted with two main issues for HTL research. Herein, we introduce didodecyl dimethyl ammonium bromide (DDAB) into the HTL of spiro-OMeTAD. The long alkyl chain of DDAB can increase the hydrophobicity of HTLs and improve environmental stability of the device, and the anion on DDAB can interact with redundant lead, which passivates defects and decreases the trap-state density and nonradiative recombination at the interface. Meanwhile, the introduction of DDAB adjusts the energy array between the HTL and perovskite, and the photovoltage of the device is increased to 1.17 V. Consequently, after doping with DDAB, the PSCs achieve a champion power conversion efficiency of 21.11%, and an unpackaged device could maintain efficiency at 82% after being exposed to 30% relative humidity for 700 h.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Zilu Li,Yue Ma,Kefei Zhao,Chenhui Zhang,Yuxia Gao,Fengpei Du
The addition of a surfactant is a constructive strategy to enhance the deposition of pesticides on plant leaves in agriculture. However, currently used surfactants normally require to be used at high concentrations, and most of them are anionic or nonionic. In this work, we found that didecyldimethylammonium bromide (DDAB), a double-chain cationic surfactant, can not only inhibit droplets from receding and rebounding but also promote sufficient spreading on paraffin and Chenopodium album L. leaf surfaces at an ultralow concentration (0.05%), in comparison with widely reported sodium dodecyl sulfate (SDS) and bis(2-ethylhexyl)sulfosuccinate (AOT). This phenomenon is attributed to the fast adsorption kinetics of DDAB from the bulk to the newly created interface (mere 100 ms), decreasing the surface tension significantly. Field experiments further prove that the addition of DDAB can significantly improve the control efficiency of herbicides. Our findings provide a simple and effective way for improving the droplet deposition on hydrophobic plant surfaces, which may lead to economic and environmental benefits in the future.
研究领域:
植物学
·
农业科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Cheng-Kun Lv,Fei Zheng,Xiao-Yu Yang,Peng-Qing Bi,Meng-Si Niu,Yu-Zhu Wang,Trevor A. Smith,Kenneth P. Ghiggino,Xiao-Tao Hao
A facile method is proposed to obtain modified shorn graphene oxide (DDAB-sGO) with improved dispersion in organic solvents. Didodecyl dimethylammonium bromide (DDAB)-sGO, which exhibits good dispersibility in the nonpolar solvent o-dichlorobenzene, was obtained via the sono-Fenton reaction and DDAB ionic functionalization. DDAB-sGO was used in the preparation of conjugated polymer:fullerene blend composites. UV–visible absorption spectra, steady-state photoluminescence spectra, fluorescence decay, and grazing incidence X-ray scattering measurements were applied to characterize morphologies, structural features, and charge-transport characteristics of the composites. Doped into poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7):[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) conjugated polymer blends, DDAB-sGO is shown to facilitate increased crystallinity and phase separation of PTB7 and PC71BM to achieve a more optimal morphology for bulk heterojunction solar cells, resulting in a ∼12% enhancement in power conversion efficiency over the undoped PTB7:PC71BM blend.
研究领域:
材料科学
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纳米技术
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太阳能
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RHEOLOGY
·
2024
·Vol. 68
·期 3
·463-477
·
IF 3
Cui Shu-Ming,Hashmi Saud,Li Wen-Qiang,Handschuh-Wang Stephan,Zhu Cheng-Tian,Wang Shi-Chang,Yang Pian-Pian,Zhu Guang-Ming,Stadler Florian J.
Nonlinear rheology of Pickering emulsions is used to further investigate the nonlinear and unrecoverable transformation of inner structures, which is beyond the linear viscoelastic regime of tiny structural disturbances. Exploring various rheological methods plays a vital role in emulsion applications, such as simulating the macroscopic structural transformation between static and liquidlike flow states, strain overshoot, and regeneration for broken structures. According to our previous studies, cellulose nanofibers (CNFs) Pickering emulsions are a typical system for investigating polymer-based emulsions with the auxiliary surfactant [didodecyldimethylammonium bromide (DDAB)] for enhancing CNF absorption. To further study different rheological properties by varying CNF or DDAB contents, multiple interval thixotropic test, large amplitude oscillatory shear, and concentration-time-dependent superposition are employed to study the linear viscoelasticity and structural transformation of nonlinear range. This research was conducted based on the previous published works [Cui et al. , Materials 15 , 8285 (2022)] as a further characterization for the same sample series.
研究领域:
材料科学
·
流变学
·
胶体科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yu Zhang,Guangning Hou,Yong Wu,Maosheng Chen,Yannan Dai,Shaohua Liu,Qingbiao Zhao,Hechun Lin,Junfeng Fang,Chengbin Jing,Junhao Chu
Oleylamine/oleic acid (OAm/OA) as the commonly used ligand is indispensable in the synthesis of perovskite nanocrystals (PNCs). Unfortunately, poor colloidal stability and unsatisfactory photoluminescence quantum yield (PLQY) are observed, resulting from a highly dynamic binding nature between ligands. Herein, we adopt a facile hybrid ligand (DDAB/ZnBr2) passivation strategy to reconstruct the surface chemistry of CsPbBr3 NCs. The hybrid ligand can detach the native surface ligand, in which the acid–base reactions between ligands are suppressed effectively. Also, they can substitute the loose capping ligand, anchor to the surface firmly, and supply sufficient halogens to passivate the surface trap, realizing an exceptional PLQY of 95% and an enhanced tolerance toward ambient storage, UV irradiation, anti-solvents, and thermal treatment. Besides, the as-fabricated white light-emitting diode (WLED) utilizing the PNCs as the green-emitting phosphor has a luminous efficiency around 73 lm/W; the color gamut covers 125% of the NTSC standard.
研究领域:
材料科学
·
纳米技术
·
光电技术
✓ 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）