PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 35
·23898-23904
·
IF 4.123
Congdi Shang,Li Wang,Yanqin An,Ping Chen,Xingmao Chang,Yanyu Qi,Rui Kang,Yu Fang
Fast, sensitive and selective detection of diamines in the vapor phase is of pivotal importance for air and food quality monitoring. In this work, an electron-poor fluorophore, perylene bisimide (PBI), was modified with hydrophilic residues at its bay positions, resulting in an amphiphilic derivative, PEBBO. Photophysical studies revealed that the compound shows a strong aggregation tendency in various solvents, but the aggregates could be highly fluorescent provided suitable solvents are used. Accordingly, a fluorescent film was constructed via utilization of the well-known Langmuir–Blodgett technique. Sensing performance studies revealed that the film as prepared is sensitive and selective to the presence of diamines in air. Specifically, (1) the experimental detection limit is lower than 0.016 g m−3 and the linear range of the analysis extends from 0.33 g m−3 to 8.20 g m−3 when ethylenediamine was adopted as an example analyte; (2) the presence of other amines and solvents shows little effect upon detection; (3) the response time is less than 5 s. Considering the importance of diamine sensing, the convenience of fluorescence techniques and the superiorities of the film and method as developed, it is believed that the present work is of great importance for promoting technical progress in diamine sensing.
研究领域:
化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Min Li,You Yang,Ran Wang,Xudong Yu,Jianmin Gu,Yandi Rao,Jingjing Su,Jinghong Li,Tifeng Jiao
Cholesterol is widely used in the field of amphiphilic self-assembly as a small organic molecular structural unit. In this article, new cholesterol amide derivative (CHAM) films via molecular self-assembly technology have been successfully prepared. Scanning electron microscope, transmission electron microscope, UV–Vis spectra, atomic force microscopy (AFM), contact angle and Fourier transform infrared spectroscopy were measured to characterize the morphology and nanostructure of the prepared self-assembled CHAM Langmuir–Blodgett (LB) films. The obtained experimental data revealed that different subphases played an important role in formation of a stable LB film, resulting in different assembly behavior. CHAM contains adamantane units and highly symmetrical tricyclic aliphatic hydrocarbon clusters, so it can combined with cyclodextrin through host–guest interact, for CHAM act as host and cyclodextrin containing a hydrophobic cavity act as guest. The morphology of single-layer Langmuir films with different subphases was characterized by AFM, indicating that the CHAM molecules formed a stable LB films on the surface of the pure water subphase, cyclodextrin subphase and cyclodextrin polymer subphase. The photoelectric properties were characterized by J-V characteristics, EIS response and impedance map, and it was found that the CHAM film had better photoelectric properties.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2013
·
IF 0.276
YUDI GUO,DONGYAN TANG,SHUO GU
The dependence of particulate Langmuir–Blodgett (LB) monolayer quality on the surface nature of the substrate was investigated by pretreating the substrates with different methods, and the optimal withdrawal speed was determined by detecting the quality of particulate monolayers deposited at different withdrawal speeds. Furthermore, the effects of stearic acid (SA) concentration on the quality of particulate monolayers were discussed. Results indicated that surface amination would favor the transfer of the floating particulate monolayer from the interface to the substrate, which would be attributed to the formation of chemical bonds between the – NH 2 groups on the substrate surface and the functional groups of – COOH and Si – OH groups on surfaces of particles floating at the interface. And the withdrawal speed of 1 mm ⋅ min -1 was appropriate for the fabrication of high-quality particulate LB monolayer because low withdrawal speed can offer sufficient time to form chemical bonds and expel the subphase from the substrate. Additionally, SEM images illustrated that the SA concentration of 0.40 mg ⋅ mL -1 was suitable for the fabrication of well-ordered particulate LB monolayers composed by the particles of 380 nm.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Dongxue Han,Guohua Li,Jie Wang,Teng Zheng,Liang Peng,Lin Li,Tifeng Jiao
Self-assembly is a technique that utilizes non-covalent interactions between molecules to assemble into ordered nano-scale aggregates from disordered states. Langmuir-Blodgett (LB) technique is one of the commonly applied methods for constructing molecular assemblies at gas-liquid interfaces. In this study, a series of ordered composite films of amino-functionalized carbon nanotubes (MWCNTs-NH 2 ) and different dye molecules were prepared using LB technique. The surface-enhanced Raman scattering (SERS) performance of MWCNTs-NH 2 /dye composite films was investigated. The experimental results showed that MWCNTs-NH 2 /Methylene blue (MB) composite film exhibited good SERS enhancement performance for Rhodamine 6 G (R6G) molecules with an enhanced factor (EF) of 2.16 × 10 5 , and had certain repeatability and uniformity, making it suitable for the detection of trace molecule. The photoelectric conversion efficiency of MWCNTs-NH 2 /dye composite films were also explored. MWCNTs-NH 2 /MB composite film not only exhibited the highest photocurrent value but also had the smallest impedance compared with the other films, indicating that it had lower impedance, better carrier transport rate, and more stable performance. This work provides an effective method for fabricating the composite LB films based on the carbon nanotubes with great SERS and photoelectric conversion efficiency.
研究领域:
材料科学
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纳米技术
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光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2015
·Vol. 162
·期 4
·H229
·
IF 3.266
Mei Huang,Xiaoli Mao,Dechao Chen,Shulian He,Shuai He,Wenhong Liu,Jinzhang Xu,Shiding Miao
A new type of Nile blue (Nb) derivative molecules terminated with long-chain alkyl (termed as Nb18) has been synthesized from precursors of barium stearate and 3-amino-7-(diethylamino)-1,2-benzophenoxazin sulfate. Optical characterizations including UV-Vis absorption, fluorescence emission, excitation spectra and the infrared spectroscopy reveal a blueshift in the band emission of Nb18 as compared to the Nb molecule, and this shift was found to be reasoned by incorporation of long-chain alkyl groups and replacement of SO42−. The amphiphilic Nb18 molecules were found to form stable Langmuir monolayers over aqueous solutions, and this allows one to study the kinetics of Nb18 formation by means of surficial chemistry. The synthetic reaction was demonstrated to have first-order kinetics with a rate constant of ∼0.0033 s−1. Using different techniques (Langmuir-Blodgett and Langmuir-Schaefer) monolayers of Nb18 were deposited on an electrode where the amphiphilic molecules were differently oriented. Investigation of these films undertaken to confirm some of the previous electrochemical observations indicated that the electro-catalytic activity stems from the cationic rings of aromatic oxazine regarding to the oxidation of dihydronicotinamide adenine dinucleotide (NADH).
研究领域:
有机化学
·
表面化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Chongling Wang,Na Li,Pengfei Bian,Guohua Li,Jingyue Yang,Qing Li,Tifeng Jiao
Molecular self-assembly is a technology in which different structural components spontaneously form assemblies with special functions through weak, reversible non-covalent interactions on the basis of molecular recognition . The amphiphilic and biocompatibility of polypeptides make it has natural advantage in self-assembly at the air-water interface. In this work, the self-assembled films of palmitoyl pentapeptide-4 (PP4) and dye molecules were prepared by Langmuir-Blodgett (LB) technology. It was found that the PP4/dye composite film had good acid-alkali gas response. In addition, the LB film prepared by PP4 and methyl orange (MO) showed chiral signal, which was reflected in the circular dichroism spectrum. The current research work provides new clues for the preparation of functional self-assembled films and their applications as gas sensors and chemical switches.
研究领域:
生物化学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Tianyue Zhao,Ran Wang,Shengnan Wei,Lexin Zhang,Zhiwei Liu,Mingli Wang,Tifeng Jiao
In this work, the self-assembled films of sericin protein (SP), silk fibroin (SF), and dye molecules were prepared by the Langmuir-Blodgett (LB) technique. Surface-enhanced Raman scattering (SERS) experiments demonstrated that the SP/saffron T (ST)-80 and SF/ST-60 composite LB films exhibited good Raman enhancement characteristics with enhancement factors (EFs) of 5.74×10 4 and 7.05×10 4 , respectively. The relative standard deviations (RSDs) of Raman intensity were 7.19% and 18.40%, respectively, confirming the uniformity of the composite LB films. Furthermore, photoelectric conversion efficiencies indicate that the electrodes fabricated from SP/ST and SF/ST film electrodes have high carrier rates and good photocurrent generation properties. This study provides novel insights into the fabrication of multifunctional SP/dye and SF/dye composite LB films, demonstrating their potential applications in SERS and photovoltaic conversion.
研究领域:
材料科学
·
生物物理学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Cuiru Wang,Xinyu Li,Wenhui Gu,Yisong Zhao,Tifeng Jiao
The composite Langmuir-Blodgett films of organic photovoltaic materials demonstrate unique advantages in the fields of photovoltaic devices, sensing, and chiral optics by fusing the functionality of organic materials with the orderliness of LB technology through precise assembly at the molecular scale. In this study, composite LB films of o-phenylphenoxyethyl acrylate (OPPEA) and bis-etherfluorene acrylate (A-BPEF) with Congo red (CR), methylene blue (MB), rhodamine B (RhB), and Saffron T (ST) dyes, respectively, have been successfully prepared by LB technology. The microstructure and optical properties of the composite films were systematically characterized by means of surface pressure-area isotherms (π-A curves), atomic force microscopy (AFM), transmission electron microscopy (TEM), contact angle measurements, and UV–visible spectroscopy, and the acid-base gas response and photoelectric conversion properties were investigated. The results show that different dye subphases significantly affect the molecular arrangement and microscopic morphology of the composite films, and the OPPEA/CR and A-BPEF/CR composite films exhibit significant response to HCl and NH 3 gases, while the OPPEA/RhB and A-BPEF/ST composite films show excellent photoelectric conversion efficiency and stability. This study provides a theoretical basis for the design and application of high-performance organic photovoltaic materials.
研究领域:
有机光伏
·
材料科学
·
薄膜技术
·
传感器
·
自组装
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）