Amphiphilic Molecules of Nb18: Synthesis, Langmuir-Blodgett Films Construction and Applications in Electro-Catalysts

Huang, Mei; Mao, Xinyu; Chen, Dechao; He, Shulian; He, Shuai; Liu, Wenhong; Xu, Jinzhang; Miao, Shiding

doi:10.1149/2.0691504jes

Cited by 3 publications

(7 citation statements)

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“…To study the photoluminescence properties of the hybrid film, we recorded the fluorescence spectra by using different excitation wavelengths of 470, 480, and 490 nm. In the hybrid films all spectra exhibit only one PL band at 550 nm, which is blue-shifted as compared with the PL emission at 655 nm of the free-state Nb . The hypsochromic shift in PL emission further confirms the variation in the electronic bands of the adsorbed Nb molecules.…”

Section: Resultsmentioning

confidence: 59%

“…The quantum yield (QY) of fluorescence was evaluated by comparison of the area under the peak of the Nb with that of reference organic dyes (rhodamine 6G in ethanol, QY = 95%) at the same excitation wavelength with equal optical density . The adsorbed state I was found to have higher QY than the free-state Nb (excitation wavelength: λ ex = 505 nm), and this could mainly be due to the compact oxazine rings . When we excited the Nb+CA+Clay film by using the wavelength at the adsorbed state II (λ ex = 590 nm), we could not get any luminescence.…”

Section: Resultsmentioning

confidence: 99%

“…This type of molecules has planar rigid aromatic (oxazine) rings in their cationic parts; however, the pristine Nb cannot form stable Langmuir layers over the water subphase. In a previous piece of work, we have fabricated a derivative (termed as Nb18) of Nb by grafting a long-chain alkyl (C18) that forms stable Langmuir layers . Encouraged by these results, we turned our attention to preparing LB films constructed with pristine Nb, which might find more applications in the biolabeling and/or biocatalysis …”

Section: Introductionmentioning

confidence: 99%

“…In a previous piece of work, we have fabricated a derivative (termed as Nb18) of Nb by grafting a long-chain alkyl (C18) that forms stable Langmuir layers. 11 Encouraged by these results, we turned our attention to preparing LB films constructed with pristine Nb, which might find more applications in the biolabeling and/or biocatalysis. 12 A Langmuir monolayer of amphiphilic molecules should be constructed to prepare hybrid films of pristine Nb, and thus it is feasible to immobilize the pristine Nb molecules on a solid matrix with desired configurations.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Inspections on Molecular Configurations of Nile Blue A Adsorbed on the Elementary Clay Sheets

Huang

Liu

et al. 2015

J. Phys. Chem. B

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Studies on the configuration of dye molecules are of great importance in revealing origins of the electronic bands as well as understanding their transitions. In this work, we utilized dye molecules named Nile blue A, which are a type of oxazine dyes, to study the molecular configurations when they are transferred from solutions to a solid surface. The Langmuir-Blodgett (LB) technique was employed to construct such an interface where the interaction between the dye molecules and solid supports can be pursued. Hybrid films were prepared via the LB depositions, and the dye molecules were assembled on the elementary clay sheets (laponite, saponite). The configuration of Nb reflected by the molecular orientation, packing density, phase behavior, and variances of the surface tension has been derived. The ex situ spectroscopy characterizations such as UV-vis absorption, fluorescence emission, and excitation spectra were carried out on these LB films to reveal the fact that the adsorbed Nb molecules are mainly assembled in two types of configurations. Adsorbed state I was found to be achieved at high concentrations (1-10 ppm) of clay dispersions and low surface pressure (∼5 mN/m). In this state the anionic oxazine rings of Nb are adsorbed on clay sheets sharing a large lift-off area. This configuration gives allowable fluorescence (λ = 550 nm). Lower clay concentration (<1 ppm) and high surface pressure (10-30 mN/m) yield the adsorbed state II in which the oxazine chromophores were arranged in a side-by-side style, and the dye molecules stand perpendicularly to the clay sheets. This conformation exhibits no photoluminescence.

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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectral Inspections on Molecular Configurations of Nile Blue A Adsorbed on the Elementary Clay Sheets

Huang

Liu

et al. 2015

J. Phys. Chem. B

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“…The organized mono- and multilayers of LB films are therefore more importance for gaining insights into the interfacial electron transfer reactions [ 64 ]. The LB method therefore contributed an indispensable role in various electrochemical applications, including catalytic [ 65 ], electrochromic [ 66 ], electronic [ 67 , 68 ], photonic [ 68 ] and biosensing [ 69 ] devices.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Langmuir–Blodgett Graphene-Based Films for Algal Biophotovoltaic Fuel Cells

et al. 2022

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The prevalence of photosynthesis, as the major natural solar energy transduction mechanism or biophotovoltaics (BPV), has always intrigued mankind. Over the last decades, we have learned to extract this renewable energy through continuously improving solid-state semiconductive devices, such as the photovoltaic solar cell. Direct utilization of plant-based BPVs has, however, been almost impracticable so far. Nevertheless, the electrochemical platform of fuel cells (FCs) relying on redox potentials of algae suspensions or biofilms on functionalized anode materials has in recent years increasingly been demonstrated to produce clean or carbon-negative electrical power generators. Interestingly, these algal BPVs offer unparalleled advantages, including carbon sequestration, bioremediation and biomass harvesting, while producing electricity. The development of high performance and durable BPVs is dependent on upgraded anode materials with electrochemically dynamic nanostructures. However, the current challenges in the optimization of anode materials remain significant barriers towards the development of commercially viable technology. In this context, two-dimensional (2D) graphene-based carbonaceous material has widely been exploited in such FCs due to its flexible surface functionalization properties. Attempts to economically improve power outputs have, however, been futile owing to molecular scale disorders that limit efficient charge coupling for maximum power generation within the anodic films. Recently, Langmuir–Blodgett (LB) film has been substantiated as an efficacious film-forming technique to tackle the above limitations of algal BPVs; however, the aforesaid technology remains vastly untapped in BPVs. An in-depth electromechanistic view of the fabrication of LB films and their electron transference mechanisms is of huge significance for the scalability of BPVs. However, an inclusive review of LB films applicable to BPVs has yet to be undertaken, prohibiting futuristic applications. Consequently, we report an inclusive description of a contextual outline, functional principles, the LB film-formation mechanism, recent endeavors in developing LB films and acute encounters with prevailing BPV anode materials. Furthermore, the research and scale-up challenges relating to LB film-integrated BPVs are presented along with innovative perceptions of how to improve their practicability in scale-up processes.

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Catalytic synergistic effects between Pt nanocrystals and elementary graphite oxides: A new insight detected by Langmuir-Blodgett technique

Ning

Wang

Xue

et al. 2020

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Amphiphilic Molecules of Nb18: Synthesis, Langmuir-Blodgett Films Construction and Applications in Electro-Catalysts

Cited by 3 publications

References 50 publications

Spectral Inspections on Molecular Configurations of Nile Blue A Adsorbed on the Elementary Clay Sheets

Spectral Inspections on Molecular Configurations of Nile Blue A Adsorbed on the Elementary Clay Sheets

Langmuir–Blodgett Graphene-Based Films for Algal Biophotovoltaic Fuel Cells

Catalytic synergistic effects between Pt nanocrystals and elementary graphite oxides: A new insight detected by Langmuir-Blodgett technique

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