JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2013
·
IF 3.172
Yangyang Xu,Jingguo Li,Wenlong Hu,Gang Zou,Qijin Zhang
Herein, a novel single-chain coumarin-substituted diacetylene monomer (CODA) was synthesized. CODA LB films exhibited obvious chirality although CODA monomer was achiral. Upon UV irradiation , CODA LB films could be polymerized into blue form and exhibit reversible thermochromism and chiroptical properties. Strong intermolecular interaction among the coumarin chromophores was assumed to be responsible for the complete reversibility of absorption and chiroptical changes for PCODA films upon thermal stimulus. And the helical packing of the coumarin chromophores seemed to play a dominating role in the subsequent formation of the helical PDA backbone. Moreover, the single-chain CODA monomer could be further photo-dimerized, and a novel gemini-type diacetylene monomer (DCODA) could be prepared. The effects of the photo-dimerization reaction of the coumarin moieties on the thermochromism and chiroptical properties of the resulting PDCODA films had been evaluated. The dimerization of head groups would enhance the thermal stability of PDCODA films but inhibit the chirality formation for PDA backbone.
研究领域:
材料化学
·
高分子科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Pengfei Bian,Huiqing Yang,Lexin Zhang,Zhiwei Liu,Guiying Qiao,Yong Han,Tifeng Jiao
Novel organic small molecule structures have received increasing attention in the preparation of multifunctional thin film materials and have become the subject of research in many cutting-edge directions. In this work, imidazolyl and transbutylene glycolic acid molecules and dye molecules were designed and prepared as composite films by supramolecular self-assembly in the LB technique, and their morphological features and spectral properties were analyzed. The results showed that the prepared LB films presented different aggregation states. In addition, their photoelectrochemical properties, on ITO sheets were tested, all of which showed good optoelectronic properties, and their binding energies, structure optimization, and electrostatic potentials were theoretically calculated by DFT simulations, which proved that the prepared films have good optoelectronic properties, and have the potential to become optoelectronic multifunctional ultrathin film devices.
研究领域:
材料科学
·
有机化学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jingwen Song,Kai Ma,Tifeng Jiao,Ruirui Xing,Lexin Zhang,Jingxin Zhou,Qiuming Peng
Graphene oxide (GO)-based nanocomposite films via facile and appropriate self-assembly methods have demonstrated many potential applications in wide fields. This study demonstrates a facile and clean route to prepare graphene oxide-dye composite films using Langmuir-Blodgett (LB) technique at room temperature. By electrostatic interaction between cationic dye molecules and negatively charged GO sheets as well as π-π interactions, GO-dye composite LB films were formed spontaneously. As a soft platform for dye molecules, GO sheets induce dye molecules to self-assemble and form highly ordered structures containing H-aggregates and/or J-aggregates. The morphological characterization results show the formation of GO-dye composite films with smooth and dense surfaces. And the spectral results reveal that dye molecules stack in well-organized aggregates on the surface of GO sheets corresponding to monomers in bulk solution. The present research work about GO-dye composite films by LB method may provide new clues to prepare organized composite films and demonstrate potential applications in many fields.
研究领域:
材料科学
·
纳米科技
·
表面化学
·
胶体与界面科学
·
功能薄膜
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wenhui Gu,Pengfei Bian,Liu Wang,Xinyu Li,Zhiwei Liu,Lukang Ji,Mingli Wang,Tifeng Jiao
Artificial supramolecular materials have found extensive applications in many fields such as biology, chirality, and information science. The Langmuir-Blodgett (LB) film technology, as an effective means of molecular assembly, offers broad prospects for the preparation of functional materials with specific properties. This study focuses on a chiral and amphiphilic molecule - the glutamine-azobenzene molecule (GAZS) composite Langmuir-Blodgett film. Through the LB technique, GAZS molecules were successfully compounded with MB, ST, and RhB subphases to form multi-layer films. The interfacial aggregation behavior of this film was thoroughly explored, and its morphological characteristics and spectral properties were analyzed. The results show that the LB films which are prepared exhibit the same J-aggregation state. The surface-enhanced Raman scattering (SERS) experiment shows that the composite LB films which are prepared have outstanding Raman enhancement performance, with an enhancement factor (EF) of 2.46 × 10 5 . Additionally, the Raman intensity has a relative standard deviation of 12.30 %, which implies that the composite films possess excellent reproducibility and uniformity. Thus, they are suitable for the detection of trace molecules. The circular dichroism spectroscopy proves that the LB films formed after the combination of GAZS molecules and dye subphases exhibit obvious chiral signals, providing some insights into the performance research and application expansion of chiral photo-supramolecular material composite LB films. Through the photoelectric conversion test of transferring multi-layer films onto indium tin oxide (ITO), it is found that the self-assembled LB films exhibit outstanding photoelectrochemical characteristics. The GAZS molecules show a more powerful photoelectric conversion effect. under the RhB subphase, providing a reference for the further exploration of the applications of GAZS molecule composite LB films in optoelectronic devices.
研究领域:
材料科学
·
光化学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2023
·Vol. 13
·期 12
·1024
·
IF 5.4
Yanju Wu,Keyu Chen,Fei Wang
In this study, a composite film was developed for the electrochemical sensing of tryptophan (Trp). Porous reduced graphene oxide (PrGO) was utilized as the electron transfer layer, and a C-undecylcalix[4]resorcinarene Langmuir–Blodgett (CUCR-LB) film served as the molecular recognition layer. Atomic force microscopy (AFM), transmission electron microscopy (TEM), Raman spectroscopy, scanning electron microscopy (SEM), and electrochemical experiments were employed to analyze the characteristics of the CUCR-LB/PrGO composite film. The electrochemical behavior of Trp on the CUCR-LB/PrGO composite film was investigated, revealing a Trp linear response range of 1.0 × 10−7to 3.0 × 10−5mol L−1and a detection limit of 3.0 × 10−8mol L−1. Furthermore, the developed electroanalytical method successfully determined Trp content in an amino acid injection sample. This study not only introduces a rapid and reliable electrochemical method for the determination of Trp but also presents a new strategy for constructing high-performance electrochemical sensing platforms.Keywords:Langmuir–Blodgett film;porous reduced graphene oxide;calix[4]arene;electrochemical sensing;tryptophan
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Bai-Chen Liu,Bo Tu,Dong-Jin Qian
Photoluminescence regulated by the Förster resonance energy transfer (FRET) process attracts much attention for the development of novel luminescent materials and devices. Here, an efficient FRET system has been designed and constructed with the use of aggregation-induced emission (AIE) units as the energy donor and sulforhodamine B (SRB) as the acceptor in the aggregates, mixed solid powders, and Langmuir–Blodgett (LB) films. Two amphiphilic tetraphenylethene derivatives with octyl chains (C8TPEs) are synthesized and used as AIEgens, which can form well-organized mixed monolayers with arachidic acid (AA) on the SRB subphase surfaces. Efficient photoinduced energy transfer is observed from AIEgens to SRB in the C8TPE/SRB powders and C8TPE-AA/SRB hybrid LB films, with the luminescent colors changing from green through yellow to orange. The differences in their FRET behaviors are interpreted in terms of the highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) energy gaps, absorption spectra, and intramolecular charge transfer characteristics by time-dependent density functional theory calculations. It is further revealed that by controlling the SRB concentrations in the subphase, the luminescent emission wavelength for the C8TPE-AA/SRB hybrid LB films shifts from 490 to 592 nm, that is, from typical AIE to SRB emission. Therefore, this work provides a viable strategy for developing solid-state FRET systems by combining AIEgens’ donor with aggregation-caused quenching type acceptors, highlighting their potential in optoelectronic and sensing applications.
研究领域:
材料科学
·
光物理学
·
纳米科技
·
表面化学
·
分子光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Chao-Yu Wang,Bai-Chen Liu,Tao Tu,Bo Tu,Dong-Jin Qian
Molecular structure, external stimuli, and environmental factors all have a strong effect on the internal molecular rotation and vibration of aggregate-induced emission (AIE) luminogens. Here, we report the AIE effect for several newly synthesized amphiphilic tetra(benzimidazole)phenylethene (TBiPE) derivatives and their binuclear N-heterocyclic carbene silver (NHC-Ag) metallacycles in solutions, aggregates, and Langmuir–Blodgett (LB) films. Monolayer behaviors and microscopic images indicate that introducing alkyl chains and binuclear NHC-Ag metallacycles can facilitate the formation of a well-defined insoluble monomolecular layer at the air–water interface. Absorption and luminescence spectral features suggest that both the TBiPEs’ cyclization structure and binuclear NHC-Ag metallacycles can provide additional driving forces to restrict the internal molecular motion of the tetraphenylethene (TPE) unit, thus enhancing the AIE effects. Further, external stimuli and environmental factors such as poor solvent addition and LB film deposition also play important roles in the photoluminescent intensity, maximum wavelength, and lifetime. These internal and external factors can result in around 30–40 nm blue-shift for the maximum luminescence wavelength and 2–3 times shorter for the luminescent lifetime. These phenomena can be attributed to the reason that the nonradiative energy transfer efficiency is weakened because of the enhanced hydrophobic interaction and metal–carbene coordination as well as the closely packed arrangement of AIEgens in the LB films; consequently, the radiation energy transfer efficiency increased.
研究领域:
材料科学
·
物理化学
·
光化学
·
表面科学
✓ 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）