Ultraviolet mem-sensors: flexible anisotropic composites featuring giant photocurrent enhancement

Chiolerio, Alessandro; Roppolo, Ignazio; Cauda, Valentina; Crepaldi, Marco; Bocchini, Sergio; Verna, Alessio; Pirri, Candido Fabrizio

doi:10.1007/s12274-014-0705-2

Cited by 27 publications

(30 citation statements)

References 27 publications

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“…During the last decades, various studies concerning the control of the nucleation and the growth of ZnO nano/microstructures embedded in polymeric matrices have been reported, with a special emphasis on the particles morphological control and its influence on their physical properties [19,20]. In this context, Chiolerio et al have developed a method to fabricate a mem-sensor in which ZnO wires embedded in a polymeric matrix are ordered to create morphological anisotropy by means of dielectrophoresis [21].…”

Section: Introductionmentioning

confidence: 99%

Contribution of TEMPO-Oxidized Cellulose Gel in the Formation of Flower-Like Zinc Oxide Superstructures: Characterization of the TOCgel/ZnO Composite Films

Jradi¹,

Maury²,

Daneault³

2015

Applied Sciences

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Abstract:In the present paper, we report on a simple and new approach for the synthesis of hierarchical flower-like zinc oxide superstructures ZnO (FL) in the presence of the TEMPO-oxidized cellulose gel (TOCgel) through a room temperature sol-gel process in aqueous medium. Resulting composite films based on TOCgel and ZnO were investigated by several techniques including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and mechanical tests. SEM images demonstrated the formation of well-shaped flower-like ZnO superstructures within the fibrous structure of the TOCgel with a uniform diameter (~5 μm). FTIR and XPS results clearly confirmed the formation of such ZnO structures. We suggested that the carboxylate groups of TOCgel fibers act as capping agents and promote the construction of such flower-like ZnO via a nucleation-growth process. A proposed mechanism based on the oriented attachment-driven growth was discussed in order to explain the formation of ZnO (FL). The photocatalytic activity of the TOCgel/ZnO composite in the degradation of methylene blue (MB) under UV irradiation was clearly confirmed. Finally, mechanical tests demonstrated that the former TOCgel/ZnO film maintained a good flexibility (bent up to ~120°) without losing its photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

Contribution of TEMPO-Oxidized Cellulose Gel in the Formation of Flower-Like Zinc Oxide Superstructures: Characterization of the TOCgel/ZnO Composite Films

Jradi¹,

Maury²,

Daneault³

2015

Applied Sciences

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“…Up to now, fl exible UV PDs have been built on many kinds of 1D binary metal oxide nanostructures, including ZnO NWs/nanorods/nanobelts, SnO 2 NWs/nanobelts, TiO 2 nanorods, In 2 O 3 NWs, etc. [60][61][62][63][64][65] transparency and fl exibility. [ 66 ] Figure 1 c shows the currentvoltage ( I-V ) properties of the device with and without bending when the device was exposed to 365 nm UV light and in the dark, respectively, while Figure 1 d shows the photocurrent versus light intensities curves of the device under bending for different cycles.…”

Section: Flexible Binary-oxide-based Pdsmentioning

confidence: 99%

Flexible Photodetectors Based on 1D Inorganic Nanostructures

2015

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Flexible photodetectors with excellent flexibility, high mechanical stability and good detectivity, have attracted great research interest in recent years. 1D inorganic nanostructures provide a number of opportunities and capabilities for use in flexible photodetectors as they have unique geometry, good transparency, outstanding mechanical flexibility, and excellent electronic/optoelectronic properties. This article offers a comprehensive review of several types of flexible photodetectors based on 1D nanostructures from the past ten years, including flexible ultraviolet, visible, and infrared photodetectors. High‐performance organic‐inorganic hybrid photodetectors, as well as devices with 1D nanowire (NW) arrays, are also reviewed. Finally, new concepts of flexible photodetectors including piezophototronic, stretchable and self‐powered photodetectors are examined to showcase the future research in this exciting field.

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“…ZnO, because of its electrical and photoresponsive properties, has been also integrated in various electronic and optoelectronic devices . UV photodetectors, three‐terminal field effect transistors with different gate structures non‐volatile memories, light emitting diodes have been proposed, showing the importance of the integration of ZnO nanostructured materials on microelectronic chips.…”

Section: Introductionmentioning

confidence: 99%

Surface Engineering of Nanostructured ZnO Surfaces

Laurenti

Stassi

Canavese

et al. 2016

Adv Materials Inter

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are oriented in one direction and their assembly and stacking produces the wurtzite hexagonal symmetry. The noncentrosymmetric and anisotropic crystalline structure of wurtzite-like ZnO generates very interesting properties such as piezo-and pyro-electricity: the application of an external stimulus, like mechanical stress or temperature, deforms the tetrahedron structure. This deformation results in a separation between the positive and negative centers of charge, inducing the formation of a dipole moment. [7,8] The polar surface and anisotropic structure of ZnO can be usefully exploited to form different kinds of micro and nanostructures from 0D to 3D, [5] including, but not limited to nanowires, [9][10][11][12] nanotubes, [13,14] nanobelts, [15][16][17][18][19] nanorings, [20] flower-like morphologies, [21][22][23][24][25] multipods, [26,27] tetrapods, [28][29][30] sponge-like structures [31][32][33][34] and so on [29,[35][36][37][38][39] (Figure 1). Therefore, several research efforts have been invested in studying various preparation procedures for ZnO micro and nano-materials. Wet chemical approaches, like sol-gel, hydrothermal growths, electrodeposition and template-assisted routes, [40,41] as well as vapor-phase methods, for example chemical vapour deposition (CVD), physical vapour deposition (PVD) including sputtering and evaporation approaches, [42][43][44] and epitaxial growth methods [45] are among the most used ones. The great advantages of the wet chemical approaches are the high synthesis versatility, low temperature employed and low costs. [9] From the other side, dry methods take advantage of the high quality and excellent control over the level of crystallinity of the synthesized ZnO structures, as well as the absence of contamination and high purity of the final material. [46] The combination of different properties with the ease and high versatile synthesis of ZnO material in different micro and nanostructures offers a huge possibility of potential applications.For example, ZnO is already used as an efficient catalyst in the selective oxidation of involving oxygenates (i.e., alcohols, aldehydes, and carboxylic acids) and in methanol synthesis catalysts. It is also largely applied as protective, anti-corrosion layer in galvanized steel products, [49][50][51] as well as in paints and sunscreens as an UV absorber. Its biocompatibility makes this material suitable, in the form of microparticles, for paste formulations in cosmetic applications.The combination of the piezoelectric with the semiconducting properties of ZnO is found to result into new exciting physical properties, [52][53][54] and it has recently opened the research field to energy harvesting application. ZnO nanomaterials can be thus used as nanogenerators, able to convert the mechanical deformation from the surrounding environment into electrical Zinc Oxide (ZnO) nanostructures represent promising substrate materials for numerous applications, ranging from new generation solar cells, to bio-and chemical sensors. This interest is due ...

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Ultraviolet mem-sensors: flexible anisotropic composites featuring giant photocurrent enhancement

Cited by 27 publications

References 27 publications

Contribution of TEMPO-Oxidized Cellulose Gel in the Formation of Flower-Like Zinc Oxide Superstructures: Characterization of the TOCgel/ZnO Composite Films

Contribution of TEMPO-Oxidized Cellulose Gel in the Formation of Flower-Like Zinc Oxide Superstructures: Characterization of the TOCgel/ZnO Composite Films

Flexible Photodetectors Based on 1D Inorganic Nanostructures

Surface Engineering of Nanostructured ZnO Surfaces

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