Nanomaterials
·
2024
·Vol. 14
·期 18
·1514
·
IF 4.4
Feifei Wang,Lei Ge,Lin Li,Tianyue Zhao,Tifeng Jiao
The LB films prepared through the Langmuir–Blodgett (LB) technique are of significant importance for the fabrication of functional films such as optoelectronic materials and sensors. In this study, 9,9-bis (4-(2-hydroxy-ethoxy) phenyl) fluorene (BPEF) and 9,9-bis [3-phenyl-4-(β-hydroxy-ethoxy) phenyl] fluorene (BBPEF) were combined with saffron T (ST), methylene blue (MB) and Rhodamine B (RhB) dyes by LB technique to prepare ordered composite films. The nanostructures and morphologies of the composite films were analyzed by transmission electron microscopy (TEM) and atomic force microscopy (AFM). It was found that the films exhibited distinct aggregation morphologies. The UV-VIS absorption spectra showed that the concentration of dye molecules had a significant effect on the spectral characteristics. The contact Angle test shows that the prepared composite films are hydrophobic. The photovoltaic conversion performance of LB composite films was studied by transient photocurrent response experiments. It was found that BPEF/dye and BBPEF/dye composite films exhibited significant responses in photocurrent. In particular, BPEF/RhB and BBPEF/RhB composite films demonstrated excellent photoresponsive performance. This study used LB technology in combination with BPEF and BBPEF to demonstrate enhanced photocurrent and stable performance of LB film, which provided ideas for expanding the application range of materials.
研究领域:
材料科学
·
光电材料
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DOI
PubMed
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
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材料科学
·
薄膜技术
·
传感器
·
自组装
·
纳米技术
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 4
·163
·
IF 3.5
Wang Jing,Bai Wei,Wang Gongying,Li Chen,Wang Qingyin
Bisphenol-fluorene-type polycarbonate as a transparent thermoplastic resin, exhibits low birefringence due to the rigid fluorene. In this paper, a series of random co-polycarbonates (BPEF/BPA-PC) were prepared from bisphenol A(BPA), 9,9-bis[4-(2-hydroxyethoxy) phenyl] fluorene (BPEF) and diphenyl carbonate (DPC) using melt transesterification method by adjusting molar ratios of raw materials. The effects of catalyst dosage, polycondensation temperature and polycondensation time on the molecular weight of the products were systematically investigated, and the copolymer structures were characterized by FT-IR, 1 H NMR and 13 C NMR spectra tests; the thermal performance were determined by Differential Scanning Calorimeter (DSC) and thermogravimetric analysis. The molecular weights and their distributions( Đ ) were determined by Gel Permeation Chromatography. The results of GPC showed that the max M w of copolymers reached to 6.8*10 4 g/mol and Đ was 1.81. The maximal thermal decomposition temperature ( T d,5% ) of the co-polycarbonate reached to 359.3 °C. The refractive index of the materials was characterized using an Abbe refractometer and it showed refractive index (n d ) up to 1.640 under visible light. Mechanical property tests showed that the tensile strength of co-polycarbonate were significantly increased when the contents of BPEF was higher, reflecting the enhancement effect of fluorene unit on the rigidity of molecular chain.
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DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Zhanpeng Xu,Kang Li,Huihui Xu,Tingzi Yan,Yongjin Li
This study utilized a straightforward one-step method, melt extrusion , to blend polymethyl methacrylate (PMMA) with 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (BPEF) to fabricate optically transparent polymer blends , utilizing Mg(TFSI) 2 as the catalyst for the ester exchange reaction. All polymer blends demonstrated excellent mechanical and optical properties , achieving high transparency (≥90 %) in the visible spectrum. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results indicated that the blends formed a thermodynamically homogeneous system. Additionally, gel permeation chromatography (GPC) confirmed the occurrence of ester exchange reactions between PMMA and BPEF in both salted and unsalted blends. Very interestingly, without Mg(TFSI) 2 one hydroxyl group of BPEF is linked to PMMA side group through transesterification reaction, leading to a zero birefringence . Nonetheless, the inclusion of Mg(TFSI) 2 appears to facilitate the ester exchange reaction between both hydroxyl groups of BPEF and a single PMMA chain, which causes a cyclic ring structure. Such cyclic ring structure orients parallel to the planar plan, which then increases n // and also Δn.
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DOI
高影响因子
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