Switching the optical and electrical properties of carbon nanotube hybrid films using a photoresponsive dispersant as a dopant

Jintoku, Hirokuni; Matsuzawa, Yoko; Yoshida, Masaru

doi:10.1039/c8ra01447g

Cited by 8 publications

(4 citation statements)

References 37 publications

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“…Given that polymers are generally insulator [22], this thinning of the polymer shield over the CNTs facilitates the movement of charge carriers in the localized domains of the polyurethane network within the film [22], manifesting a promising light induced electrical photo-response and switching characteristics. Jintoku et al [9] reported on SWCNT, graphene hybrid films of having better absorbance by controlling the intensity and irradiation time of UV light and are switchable after visible light irradiation and thermal treatment, making them potential candidates for optoelectronic devices and sensors.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, carbon nanomaterials have shown promising photo responsive behaviour using white light (WL) as a stimuli which is readily available and is a spontaneous choice for many applications owing to its wide spectral range. Photoactive structural forms of carbon, for example functionalized SWCNTs and graphene with azobenzene can induce switching of electrical conductivity when irradiated by UV and visible light, showcasing potential utility in sensors, memory and energy storage devices [9], [10], [11], [12], [13], [14], [15].…”

Section: Introductionmentioning

confidence: 99%

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Switching Behavior of the Composite Low Dimensional Structural Hybrids of Carbon After UV Exposure

Saini,

Bhattacharjee,

Gouda

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Low dimensional multi structural components of carbon are of great interest currently owing to their applications in developing flexible plastic electronics. In this work, we discuss emergence of different structural hybrids of carbon from as-prepared HiPCO SWCNTs subjecting them to oxidative acid purification and covalent functionalization process. Transmission electron microscopy (TEM) investigations reveal single wall carbon nanotubes (SWCNTs) serve as a building block to obtain multi wall carbon nanotubes (MWCNTs), graphene sheets (GS), carbon nano scrolls (CNS) structures which coexist in the sample. These structures when grafted with polymer binder and spray coated on Si substrate provide highly sustainable thin film coatings that are stable even in adverse space conditions [1]. These CNT and CNS based composite coatings are promising candidates for stray light control space applications exhibiting a low reflectance of the order of 2-3% in the visible spectral range [1]. Electrical switching behaviour of these films were investigated by capturing current(time) (I(t)) response, displaying promising switching character with distinct ON-OFF cycle. These coatings offer opportunities for the development of facile, cost-effective carbon-based devices without going into the nontrivial task of separating different the structures.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Switching Behavior of the Composite Low Dimensional Structural Hybrids of Carbon After UV Exposure

Saini,

Bhattacharjee,

Gouda

2024

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The light-induced switching of SWCNTs and AB-based photoresponsive dispersant 22 is shown in Figure 5e. [117] The 22-SWCNT hybrid was obtained by a wet-coating method from a dispersed 22-SWCNT solution. A 22-SWCNT hybrid film exhibited switching in both electrical conductivity and near-infrared (NIR) absorbance upon UV/Vis irradiation.…”

Section: Non-covalent Approachesmentioning

confidence: 99%

Photochromic Carbon Nanomaterials: An Emerging Class of Light‐Driven Hybrid Functional Materials

Hassan,

Tang,

Bisoyi

et al. 2024

Advanced Materials

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The introduction of photochromism into nanosystems has resulted in the development of a class of light‐driven functional hybrid nanomaterials. Photochromic molecules have remarkable potential in memory and optical devices, as well as in driving and manipulating molecular motors or actuators and many other systems using light. When photochromic molecules are introduced into carbon nanomaterials (CNMs), the resulting hybrids provide unique advantages and create new functions that can be employed in specific applications and devices. In this review, we highlight the recent developments in diverse photochromic CNMs. Photochromic molecules and CNMs are also introduced. The fundamentals of different photochromic CNMs are discussed, including design principles and the types of interactions between CNMs and photochromic molecules via covalent interactions and non‐covalent bonding such as π−π stacking, amphiphilic, electrostatic, and hydrogen bonding. We then highlight the properties of photochromic CNMs, e.g., in photopatterning, fluorescence modulation, actuation, and photoinduced surface‐relief gratings; and their applications in energy storage (solar thermal fuels, photothermal batteries, and supercapacitors), nanoelectronics (transistors, molecular junctions, photo‐switchable conductance, and photoinduced electron transfer), sensors, and bioimaging. Finally, we present an outlook on the challenges and opportunities in the future of photochromic CNMs. This review discusses a vibrant interdisciplinary research field and is expected to stimulate further developments in nanoscience, advanced nanotechnology, intelligently responsive materials, and devices.This article is protected by copyright. All rights reserved

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“…The simplest yet most effective approach to modulating cold crystallization behavior is to incorporate an additive to the host. − In general, the crystallization of a system with a noninteracting additive remains unaltered, where each component excludes the other. , On the other hand, when moderate interactions are present between components, the crystallization process can be notably modified as seen in the examples of a hydrazide compound and poly(butylene succinate). , Given that the azobenzene moiety and the imidazolium ring of 1 can interact through π–π interactions, − we selected a tubular π-conjugated polymer CNT as the additive. , Furthermore, CNT is an ideal additive expected to enhance the thermophysical properties of 1 due to its good thermal conductivity, small heat capacity, and absence of phase transition within the temperature range of interest. , …”

Section: Introductionmentioning

confidence: 99%

Molecular Structural Insight into the Cold Crystallization Process of Ionic Liquid Crystals

et al. 2022

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We have demonstrated a modified crystallization process of an ionic liquid crystal, 1-{[4′-(4″-nitrophenylazo)phenyloxy]}hexyl-3-methyl-1H-imidazol-3-ium tetrafluoroborate, by the addition of carbon nanotubes (CNTs), successfully suppressing the supercooled state, and hence the cold crystallization during reheating, to the complete conversion of melt crystallization upon cooling. The enthalpies of fusion of the crystals produced were similar among the samples (29.3−32.2 kJ mol −1 ); however, a crystallization-promoting pathway that increases the crystallization enthalpy by 20% was present. Through comprehensive thermal analysis, structural analysis, and infrared spectroscopy combined with quantum chemical calculations, we propose that this effect is caused by an increased crystal nucleation rate due to the π−π interactions between the molecule and the rigid CNT surface. These results not only give insights into the crystallization processes of ionic liquids in general but also provide guidelines to expand the range of applications of cold-crystallizing ionic crystalline materials for thermal energy storage applications.

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Switching the optical and electrical properties of carbon nanotube hybrid films using a photoresponsive dispersant as a dopant

Cited by 8 publications

References 37 publications

Switching Behavior of the Composite Low Dimensional Structural Hybrids of Carbon After UV Exposure

Switching Behavior of the Composite Low Dimensional Structural Hybrids of Carbon After UV Exposure

Photochromic Carbon Nanomaterials: An Emerging Class of Light‐Driven Hybrid Functional Materials

Molecular Structural Insight into the Cold Crystallization Process of Ionic Liquid Crystals

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