Electrical and optical properties of 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) modified by carbon nanotubes

Xu, Xiangdong; Huang, Long; Fan, Kai; Jiang, Yadong; Sun, Ziqiang; He, Qiong; Ao, Tianhong; Huang, Rui; Wen, Yuejiang; Ma, Chunqiang

doi:10.1039/c3tc32209b

Cited by 24 publications

(39 citation statements)

References 43 publications

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“…2 ). Figure 2 also shows that R of DAST increases with the temperature, suggesting a positive temperature coefficient of resistance ( TCR , defined as ) 5 15 for this material. In contrast, R for both in-situ and ex-situ composite films decrease with the elevated temperature, implying negative TCR for these composites.…”

Section: Resultsmentioning

confidence: 84%

“…2 ). The positive TCR (+1.45% K −1 ) for the DAST film is due to the organic DAST 5 , while the negative TCR values of −1.67% K −1 and −2.79% K −1 suggest semiconductor characteristic for the resulting composite films. It is worth noting that lower R RT (7.5 × 10 6 Ω) and higher TCR (−2.79% K −1 ), which are favorable for optoelectronic applications and close to the levels ( R RT = 0.2 – 2 × 10 5 Ω, TCR = −2.2% K −1 ) 15 of vanadium oxide films (the most important bolometric materials for uncooled infrared (IR) detectors 15 16 ), were measured from the in-situ composite films, compared with those of the ex-situ composite films.…”

Section: Resultsmentioning

confidence: 96%

“…However, practical applications of DAST in optoelectronic or electronic devices have never been reported, largely due to its poor conductivity and the difficulty in preparing device-quality DAST–based thin films. Up until now, rather few literatures on DAST–based thin films have been published 5 6 .…”

mentioning

confidence: 99%

“…Accordingly, we predicted that combination of DAST and graphene might provide a possibility to further improve the properties, by which new functional materials with exceptional properties might be developed. Moreover, we noted that both DAST and graphene are layered two-dimensional (2D) geometries 5 6 7 8 . Such structural similarity might be helpful for improving the integration of DAST with graphene, and thereby composite films with higher quality and performance might be produced.…”

mentioning

confidence: 99%

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Conversion of 4-N,N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) from a Simple Optical Material to a Versatile Optoelectronic Material

Sun

Fan

et al. 2015

Sci Rep

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4-N,N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) is an important optical material, but its poor conductivity limits applications in devices. To tackle this problem, we designed, prepared, and systematically investigated novel binary composite films that are composed of two-dimensional (2D) DAST and 2D graphene. Results indicate that both electrical and optical properties of DAST can be significantly improved by graphene addition. The negative steric effects of big DAST molecules that greatly trouble ex-situ synthesis can be efficiently overcome by in-situ synthesis, thus leading to better film quality and higher physical properties. Consequently, the in-situ composite film exhibits a low sheet resistance of 7.5 × 106 ohm and high temperature coefficient of resistance of −2.79% K−1, close to the levels of the most important bolometric materials for uncooled infrared detectors. Particularly, a new low temperature reduction of graphene oxide induced by DAST, which is further enhanced by in-situ process, was discovered. This work presents valuable information about the DAST–graphene composite films, their chemical structures, mechanisms, physical properties, and comparison on in-situ and ex-situ syntheses of graphene–based composites, all of which will be helpful for not only theoretically studying the DAST and graphene materials and expanding their applications, but also for seeking new optoelectronic sensitive materials.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Conversion of 4-N,N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) from a Simple Optical Material to a Versatile Optoelectronic Material

Sun

Fan

et al. 2015

Sci Rep

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“…36 As displayed in the inset of Fig. 31,39 The resistances at room temperature (R RT ) and TCR for the composite films are summarized in Fig. 37 After SWCNT addition, E g decreases gradually from 2.16 eV to 2.09 eV.…”

Section: Resultsmentioning

confidence: 99%

Chemical structures and physical properties of vanadium oxide films modified by single-walled carbon nanotubes

Wang

et al. 2016

Phys. Chem. Chem. Phys.

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A series of vanadium oxide (VOx)-single-walled carbon nanotube (SWCNT) composite films with different SWCNT concentrations were prepared and systematically investigated. The results reveal that after SWCNT addition, the optical absorption and electrical conductivity of VOx are enhanced, but the crystallinity and temperature coefficient of resistance (TCR) are weakened. Consequently, either too low or too high CNT loading will lead to the degradation of the comprehensive properties. In contrast, the VOx-SWCNT composite film containing 4 wt% SWCNTs exhibits the optimal comprehensive properties such as high film uniformity, large optical absorption, and desirable sheet resistance (141 kΩ) and TCR (-1.73% K(-1)), favorable for applications in uncooled infrared detectors. Saturated interactions between SWCNTs and VOx are observed at 6 wt% SWCNTs, after which (≤10 wt% SWCNTs) the structures and properties are changed slightly. This work reveals the modification of the chemical structures and physical properties of VOx films by SWCNTs, whose results will be helpful not only for a better understanding of VOx, SWCNTs, and their composites, but also for seeking new versatile functional materials for device applications.

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Long‐Term‐Stable Strong Second Harmonic Generation in Flexible DAST−PVDF Composite Films Realized by the Interface Interactions

Cheng

Zhang

et al. 2021

Adv Materials Inter

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In this work, novel composite films that are composed of guest 4‐N,N‐dimethylamino‐4′‐N′‐methyl‐stilbazolium tosylate (DAST) and host polyvinylidene fluoride (PVDF) polymer are prepared. Results show that these guest‐host composite films offer the advantages of strong second harmonic generation (SHG), scalability, flexibility, and long‐term stability. The SHG pumped at 800 nm in the poled, thermally annealed, and phase‐matched DAST−PVDF composite films are four orders of magnitude stronger than that of a pure PVDF film, or 300 times stronger than that of a potassium dihydrogen phosphate crystal. Particularly, the interface interactions of the electrostatic interactions and the strong intermolecular hydrogen bonds between DAST and PVDF improve the conjugation of π electrons and molecular ordering of DAST, making the NLO properties of the composites tunable with the ratio of DAST:PVDF. And consequently, the high SHG of the DAST−PVDF composite films can remain stable even after exposure to air for three years.

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Electrical and optical properties of 4-N,N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) modified by carbon nanotubes

Cited by 24 publications

References 43 publications

Conversion of 4-N,N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) from a Simple Optical Material to a Versatile Optoelectronic Material

Conversion of 4-N,N-dimethylamino-4’-N’-methyl-stilbazolium tosylate (DAST) from a Simple Optical Material to a Versatile Optoelectronic Material

Chemical structures and physical properties of vanadium oxide films modified by single-walled carbon nanotubes

Long‐Term‐Stable Strong Second Harmonic Generation in Flexible DAST−PVDF Composite Films Realized by the Interface Interactions

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