Photoresponsive Nanocomposite Formed by Self‐Assembly of an Azobenzene‐Modified Silane

Liu, Nanguo; Chen, Zhu; Dunphy, Darren R.; Jiang, Ying‐Bing; Assink, Roger A.; Brinker, C. Jeffrey

doi:10.1002/anie.200250189

Cited by 175 publications

(130 citation statements)

References 25 publications

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“…The postsynthetic grafting and co-condensation methods have been widely employed to anchor various organic groups onto the surface of the pores, including organometallic species, amino and thiol groups, and functional organic groups with optical, electronic, and catalytic properties. The obtained organic-inorganic hybrids have the potential for various applications, such as adsorbents, optical devices, sensors, catalysts, mass and ion conductors, and biomimetic systems [22][23][27][28][29][30][31][32][33][34] .…”

Section: Figurementioning

confidence: 99%

Functional-template directed self-assembly (FTDSA) of mesostructured organic-inorganic hybrid materials

Sun

Zhang

et al. 2009

Sci. China Ser. B-Chem.

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Since the discovery of a surfactant directed self-assembly approach for the fabrication of mesoporous silica in 1992, increasing attention has been focused on the design and synthesis of mesostructured functional materials. Organic functionalization is becoming a major topic in this research field, since highly ordered mesostructured organic-inorganic hybrids offer novel functionalities and enhanced performance over their individual components. We begin with a brief overview of the three fundamental methods (post-synthetic grafting technique, co-condensation method, and preparation of periodic mesoporous organosilicas) for the preparation of organically functionalized mesostructured silica, and focus on one of the most promising approaches, which herein was named as functional-template directed self-assembly (FTDSA) approach, and in the eyes of the authors it has a special position in the preparation of this class of hybrid materials. A comprehensive overview of the state of research in the area of FTDSA and its potential applications will be given. mesoporous materials, self-assembly, organic-inorganic hybrids

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Section: Figurementioning

confidence: 99%

Functional-template directed self-assembly (FTDSA) of mesostructured organic-inorganic hybrid materials

Sun

Zhang

et al. 2009

Sci. China Ser. B-Chem.

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“…For example, surfactant-templated films with integral amine functionality have been synthesized which exhibit ion channel-like behavior [5]. Other systems of interest include photoresponsive materials [6] and nanostructured silica/hydrogel composites [7].…”

Section: Future Directionsmentioning

confidence: 99%

Anomalously high photocurrents in nanostructured electrodes : a new local microchip power source.

Hughes¹,

Dunphy²,

Brinker³

et al. 2004

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follows * Author to whom correspondence should be addressed 4 AbstractAn increase in photocurrent has been observed at silicon electrodes coated with nanostructured porous silica films as compared to bare, unmodified silicon. Ultimately, to utilize this effect in devices such as sensors or microchip power supplies, the physical phenomena behind this observation need to be well characterized. To this end, Electrochemical Impedance Spectroscopy (EIS) was used to characterize the effect of surfactant-templated mesoporous silica films deposited onto silicon electrodes on the electrical properties of the electrode space-charge region in an aqueous electrolyte solution, as the electrical properties of this space-charge region are responsible for the photobehavior of semiconductor devices. A significant shift in apparent flat-band potential was observed for electrodes modified with the silica film when compared to bare electrodes; the reliability of this data is suspect, however, due to contributions from surface states to the overall capacitance of the system. To assist in the interpretation of this EIS data, a series of measurements at Pt electrodes was performed with the hope of decoupling electrode and film contributions from the EIS spectra. Surprisingly, the frequency-dependent impedance data for Pt electrodes coated with a surfactant-templated film was nearly identical to that observed for bare Pt electrodes, indicating that the mesoporous film had little effect on the transport of small electrolyte ions to the electrode surface. Pore-blocking agents (tetraalkylammonium salts) were not observed to inhibit this transport process. However, untemplated (non-porous) silica films dramatically increased film resistance, indicating that our EIS data for the Pt electrodes is reliable. Overall, our preliminary conclusion is that a shift in electrical properties in the spacecharge region induced by the presence of a porous silica film is responsible for the increase in observed photocurrent.

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“…In particular, we are interested to see if and how the spectroscopic and photochemical properties change when the photochromic azobenzene units have been incorporated into the five-membered ring system of the biindenylidenedione. Additionally, despite the extensive use of photoisomerization of azo compounds in many areas of material chemistry, 9,10 there is no example of their incorporation into the biindenylidenedione bulk.…”

Section: Introductionmentioning

confidence: 99%

A New Biindenylidenedione Compound with Two Azobenzene Units: Synthesis and Photochromic Behavior Both in Solution and in the Solid State

et al. 2009

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A new photochromic biindenylidenedione compound bearing two azobenzene units was synthesized and characterized by means of 1 H NMR, 13 C NMR, ESI-MS and elemental analysis. The photochromic and photo-induced radical properties were investigated by means of UV-Vis and electron spin resonance spectroscopy, respectively. The results showed that the title compound exhibited photochromic behavior with good fatigue resistances both in solution and in the solid state.

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Photoresponsive Nanocomposite Formed by Self‐Assembly of an Azobenzene‐Modified Silane

Cited by 175 publications

References 25 publications

Functional-template directed self-assembly (FTDSA) of mesostructured organic-inorganic hybrid materials

Functional-template directed self-assembly (FTDSA) of mesostructured organic-inorganic hybrid materials

Anomalously high photocurrents in nanostructured electrodes : a new local microchip power source.

A New Biindenylidenedione Compound with Two Azobenzene Units: Synthesis and Photochromic Behavior Both in Solution and in the Solid State

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