Reversible light-induced capacitance switching of azobenzene ether/PMMA blends

Zaporojtchenko, V.; Pakula, Christina; Basuki, Sri Wahyuni; Strunskus, Thomas; Zargarani, Dordaneh; Herges, Rainer; Faupel, Franz

doi:10.1007/s00339-010-6139-5

Cited by 11 publications

(18 citation statements)

References 25 publications

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“…After evaporation of the solvent, the residue was purified by column chromatography on silica gel with hexane/ethyl acetate (9:1 Azo-e). 29 The synthesized Azo−OH (1.00 g, 3.54 mmol) and potassium carbonate (1.47 g, 10.6 mmol) were dissolved in dimethylformamide (50 mL). Then, 4bromoheptane was added dropwise to the solution at 130 °C.…”

Section: Methodsmentioning

confidence: 99%

Highly Sensitive Ultraviolet Light Sensor Based on Photoactive Organic Gate Dielectrics with an Azobenzene Derivative

Lee

Seong

et al. 2016

J. Phys. Chem. C

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Photochromic molecules have been recently adopted by many researchers for organic field-effect transistor (OFET) applications, since they offer the opportunity to achieve flexible-type ultraviolet (UV) light sensors with the advantages of organic material-based solution processes. Here, we present the novel usage of an azobenzene derivative in the gate dielectric layer of an OFET for highly sensitive and reliable UV sensing applications. Owing to the large change of capacitance caused by the reversible photoisomerization of azobenzene, the OFET device can modulate efficiently the current signal under UV and visible light. We found that the on-current was greatly amplified upon UV light irradiation with good photoresponsivity and photocurrent ratio and then fully returned to the initial state under visible light. In addition, the device shows a strongly linear relationship with the UV radiation intensity and repetitive on–off response in real-time UV sensing tests, thus being potentially applied in highly sensitive and reliable UV sensors.

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Section: Methodsmentioning

confidence: 99%

Highly Sensitive Ultraviolet Light Sensor Based on Photoactive Organic Gate Dielectrics with an Azobenzene Derivative

Lee

Seong

et al. 2016

J. Phys. Chem. C

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“…We showed recently that the dielectric properties of a highly doped polymer film can be reversibly switched by photochromic molecules on the order of 50% because of the different dipole moments in the trans and cis states, respectively. 33 The ohmic I(V) dependence observed by us clearly identifies a percolating MWCNT network. Therefore, a contribution of the two azobenzene isomers as an integral part of the conduction path between the CNT tubes can be ruled out.…”

Section: ■ Results and Discussionmentioning

confidence: 88%

Light-Controlled Conductance Switching in Azobenzene-Containing MWCNT–Polymer Nanocomposites

Basuki¹,

Schneider²,

Strunskus³

et al. 2015

ACS Appl. Mater. Interfaces

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We report on reversible light-controlled conductance switching in devices consisting of multiwalled carbon nanotube (MWCNT)-polymer nanocomposites blended with azobenzene molecules and photoisomerization of the latter. Both the azobenzene molecules and MWCNT, which are functionalized with carboxyl groups (MWCNT-COOH), are embedded independently in a poly(methyl methacrylate) matrix, and thin films are prepared by using a simple spin-coating technique. We demonstrate the feasibility of the present concept with a photocurrent switching amplitude of almost 10%.

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“…Such coupling can be achieved by a chemical bond or by using alkenes as bulky side branches grafted to the azobenzene, as in our case. In our previous experiments, high elastic modulus polymers like poly(methylmethacrylate) (PMMA) or polystyrene were used 22 , 24 , 25 , 35 . In such systems rather small or localized transfer of molecular motion was achieved 22 , 36 .…”

Section: Resultsmentioning

confidence: 99%

“…The solvent dimethylformamide was purchased from Carl Roth GmbH (ROTIPURAN 99.8%). The synthesis and the optical properties of the azobenzene chromophores (4-hexyl-phenyl-[4-(propyl-butoxy)-phenyl]-diazene) are described elsewhere 35 .…”

Section: Methodsmentioning

confidence: 99%

Light-induced Conductance Switching in Photomechanically Active Carbon Nanotube-Polymer Composites

Schneider

Polonskyi

Strunskus

et al. 2017

Sci Rep

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Novel, optically responsive devices with a host of potential applications have been demonstrated by coupling carbon nanomaterials with photochromic molecules. For light-induced conductance switching in particular, we have recently shown that carbon nanotube-polymer nanocomposites containing azobenzene are very attractive and provide stable and non-degradable changes in conductivity over time at standard laboratory conditions. In these composites, the photoswitching mechanisms are based on light-induced changes in electronic properties and related to the Pool-Frenkel conduction mechanism. However, no link between conductivity switching and the molecular motion of azobenzene chromophores could be found due to application of high elastic modulus polymer matrices. Here we report on single wall carbon nanotube-polymer nanocomposites with a soft polycaprolactone polymer host. Such a system clearly shows the transfer of light-induced, nano-sized molecular motion to macroscopic thickness changes of the composite matrix. We demonstrate that these photomechanical effects can indeed overshadow the electronic effects in conductivity switching behavior and lead to a reversion of the conductivity switching direction near the percolation threshold.

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Reversible light-induced capacitance switching of azobenzene ether/PMMA blends

Cited by 11 publications

References 25 publications

Highly Sensitive Ultraviolet Light Sensor Based on Photoactive Organic Gate Dielectrics with an Azobenzene Derivative

Highly Sensitive Ultraviolet Light Sensor Based on Photoactive Organic Gate Dielectrics with an Azobenzene Derivative

Light-Controlled Conductance Switching in Azobenzene-Containing MWCNT–Polymer Nanocomposites

Light-induced Conductance Switching in Photomechanically Active Carbon Nanotube-Polymer Composites

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