LANGMUIR
·
2024
·
IF 3.7
Bizhuo Wei,Huajing Li,Huan Chu,Huanhuan Dong,Yijun Zhang,Cai-Li Sun,Yuangang Li
This work presents a study of the thermally induced aggregation of perylene diimide (PDI) and naphthalene diimide (NDI) derivatives modified with oligo ethylene glycol (OEG) chains in aqueous solution. Water-soluble and flexible OEG side chains were introduced into the π-core of glutamate-modified NDI and PDI structures, and the aggregation process was modulated by heating or cooling in water. Interestingly, a rare opposite temperature response of fluorescent behavior from the two amphiphilic chromophores was revealed, in which the PDI exhibited fluorescent enhancement, while fluorescent quenching upon temperature increase was observed from the NDI assembly. The mechanism of thermally induced aggregation is clearly explained by studies with various spectroscopic techniques including UV–visible, fluorescence, 1H NMR, 2D NMR spectroscopy, and SEM observation as well as control experiments operated in DMSO solution. It is found that although similar J-aggregates were formed by both amphiphilic chromophores in aqueous solution, the temperature response of the aggregates to temperature was opposite. The degree of PDI aggregation decreased, while that of NDI increased upon temperature rising. This research paves a valuable way for understanding the complicated supramolecular behaviors of amphiphilic chromophores.
研究领域:
超分子化学
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材料科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2015
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IF 6.217
Yue Li,Shin-ichi Sasaki,Hitoshi Tamiaki,Cheng-Liang Liu,Jiaxing Song,Wenjing Tian,Enqiang Zheng,Yingjin Wei,Gang Chen,Xueqi Fu,Xiao-Feng Wang
The intriguing properties of extremely efficient delocalization and migration of excitons in chlorophyll (Chl) J-type aggregates have inspired intense research activities toward their structural understanding, functional interpretation and mimicry synthesis. Herein, we demonstrated the J-aggregates of zinc methyl 3-devinyl-3-hydroxymethyl-pyropheophorbide a (ZnChl-1) generated by spin-coating method for the application as a hole transporter in titania-based solar cells using methyl trans -3 2 -carboxypyropheophorbide a (H 2 Chl-2) or its zinc complex (ZnChl-2) as the sensitizer. The effective carrier mobility of the J-aggregates films was determined by the organic field-effect transistor to be 6.2 × 10 −4 cm 2 V −1 s −1 . Solar cells sharing the architecture of FTO/H 2 Chl-2 or ZnChl-2 on TiO 2 /(ZnChl-1) n /Ag were fabricated and the factors that presumably determine their photovoltaic performances were discussed. The photovoltaic devices studied herein employing inexpensive and pollution-free biomaterials provide a unique solution of utilizing solar energy with a care of the important environmental issue.
研究领域:
生物物理学
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材料科学
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可再生能源研究
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产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2022
·
IF 3.868
Na Li,Baoning Wang,Shin-ichi Sasaki,Tsutomu Miyasaka,Gang Chen,Xiao-Feng Wang
Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted great interests not only of academic field but also of industrial world toward practical applications in the last decade due to their extremely low production cost and excellent photo-physical properties. Hole-transporting layer (HTL) as an integral component of PSC plays an important role in elevating its performance. In this work, five bacteriochlorophyll- a derivatives characterized by different C17-propionate residue were prepared and their J- type aggregates were investigated as HTLs of PSCs. It was confirmed that the nature of the introduced C17-propionate side chains have negligible effects on the electrochemical properties of main dye unit, such as the electronic absorption spectra and energy levels. However, the different lipophilicity , hydrophilicity , or hydrophobicity of chain characters affect the solubility of each dye component, resulting in diverse surface morphologies of their aggregate films as revealed by AFM observations. Furthermore, the five solid films prepared by spin-coating method showed discrepant charge extraction and transport abilities as HTLs, which were supported by both photo luminescence spectra and electrochemical impedance spectroscopy measurement results and were concluded to be the fundamental reason of the different PSC performance.
研究领域:
材料科学
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能源科学
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光电化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 31
·5968-5975
·
IF 7.571
Yanhui Guo,Shuheng Huang,Han Sun,Zhe Wang,Yutong Shao,Lukun Li,Zhiliang Li,Fengling Song
Due to their excellent electronic and optical properties, porphyrins are extensively studied conjugated macrocycles in supramolecular chemistry for assembling functional nanomaterials. Although the aggregation of monomers plays a significant role in driving the self-assembly process into ordered nanostructures, it remains a challenge for tuning the self-assembling behavior of porphyrins through molecular structure modifications, especially in aqueous solutions. In the present work, two novel water-soluble porphyrin derivatives were synthesized by introducing cationic linear side chains into the π-conjugated core for phosphate-templated assembly through electrostatic interactions. It was found that the stacking patterns (H- or J-type aggregation) of porphyrins could be tuned by varying the number of side chains, which are associated with dramatic morphological change. The cytotoxicity and photodynamic properties of the J-aggregation-driven nano-assemblies were also investigated for the purpose of anti-cancer treatment. This study demonstrates a facile and effective strategy to regulate the aqueous self-assembling behavior of porphyrins that can impact the structure and properties of assembly, which will be of great benefit to the design and synthesis of functional nanomaterials for specific applications.
研究领域:
超分子化学
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纳米材料
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生物医学工程
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材料科学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yanhui Guo,Lukun Li,Shuheng Huang,Han Sun,Yutong Shao,Zhiliang Li,Fengling Song
Water is ubiquitous in natural systems where it builds an essential environment supporting biological supramolecular polymers to function, transport, and exchange. However, this extreme polar environment becomes a hindrance for the superhydrophobic functional π-conjugated molecules, causing significant negative impacts on regulating their aggregation pathways, structures, and properties of the subsequently assembled nanomaterials. It especially makes the self-assembly of ultrathin two-dimensional (2D) functional nanomaterials by π-conjugated molecules a grand challenge in water, although ultrathin 2D functional nanomaterials have exhibited unique and superior properties. Herein, we demonstrate the organic solvent-free self-assembly of one-molecule-thick 2D nanosheets based on exploring how side chain modifications rule the aggregation behaviors of π-conjugated macrocycles in water. Through an in-depth understanding of the roles of linking groups for side chains on affecting the aggregation behaviors of porphyrins in water, the regulation of molecular arrangement in the aggregated state (H- or J-type aggregation) was attained. Moreover, by arranging ionic porphyrins into 2D single layers through J-aggregation, the ultrathin nanosheets (thickness ≈ 2 nm) with excellent solubility and stability were self-assembled in pure water, which demonstrated both outstanding 1O2 generation and photothermal capability. The ultrathin nanosheets were further investigated as metal- and carrier-free nanodrugs for synergetic phototherapies of cancers both in vitro and in vivo, which are highly desirable by combining the advantages and avoiding the disadvantages of the single use of PDT or PTT.
研究领域:
材料科学
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纳米技术
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生物医学工程
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癌症研究
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光化学
✓ 已验证
DOI
PubMed
高影响因子
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