Layer-by-Layer Assembly of Multifunctional Porous N-Doped Carbon Nanotube Hybrid Architectures for Flexible Conductors and Beyond

Zhao, Songfang; Gao, Yongju; Li, Jinhui; Zhang, Guoping; Chen, Zhi; Deng, Libo; Sun, Rong; Wong, Ching‐Ping

doi:10.1021/acsami.5b00116

Cited by 23 publications

(18 citation statements)

References 40 publications

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“…Figure S10 shows that there is hardly any loss for the maximum stress of the CGS-3. This phenomenon makes it possible to be used as pressure-responsive sensors [45][46][47] and elastic conductors 48 . The SEM pictures during the compression were also collected in Figure S11.…”

Section: Resultsmentioning

confidence: 99%

A facile method to prepare highly compressible three-dimensional graphene-only sponge

Zhao

Zhang

et al. 2015

J. Mater. Chem. A

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Endowing compressibility and conductivity into graphene sponge offers the possibility to regenerate piezoresistivity and is therefore of great interest in the field of sensor. In this work, the highly compressible threedimensional graphene-only sponge (CGS) was prepared through a facile method by using ammonium sulfide and ammonia solutions under mild condition. The morphologies and microstructures of the as-prepared CGSs can be controlled by adjusting the mass ratio of graphene oxide (GO) to ammonium sulfide which changed from metallic sheen bulk with leafshaped structure to a black sponge with cellular structure. Besides, by simply change the concentrations of GO, CGSs with different porosity, conductivity as well as mechanical strength were obtained. Moreover, the resultant CGSs show ultralow density (as low as 4.9 mg cm -3 ), high porosity (as much as 99.8%), great compressibility (as much as the strain of 80%), excellent stability (100 cycles) during the compression. Furthermore, the sensitive variation of electrical resistances and cycle stability were validated under the compressive strain of 50% which make them great candidates for pressureresponsive sensors, elastic conductors and other applications.Highly compressible three-dimensional graphene-only sponge (CGS) was prepared through a facile method. CGAs show ultralow density, high porosity, great compressibility, excellent stability which make them great candidates for pressure-responsive sensors, elastic conductors and other applications.

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Section: Resultsmentioning

confidence: 99%

A facile method to prepare highly compressible three-dimensional graphene-only sponge

Zhao

Zhang

et al. 2015

J. Mater. Chem. A

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“…5a, upon the addition of NaBH 4 aqueous solution, the UV-vis absorbance band immediately shifts from 317 to 400 nm, which is attributed to the formation of 4-nitrophenolate under the alkaline condition. Meanwhile, the corresponding colors change from yellow to yellow green [36]. The reaction conversion can be calculated from C/C 0 , which is measured from the relative The concentration of NaBH 4 is higher than that of 4-NP, and it could be considered as constant during the reaction process.…”

Section: Catalytic Performancementioning

confidence: 99%

In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis

Zhao

Gao

et al. 2015

RSC Adv.

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Novel protocol to prepare multifunctional magnetic organic-inorganic nanostructured catalyst of Fe 3 O 4 @organosilicon/Ag with tailored properties is developed. Such nanostructure design endows the catalyst with superparamagnetism (11.6 emu g -1 ), excellent oxidation resistance, and catalytic activity. Fe 3 O 4 nanoparticles (NPs) are encapsulated with porous organosilicon via improved self-assembly of flexible-bridged organosilicon precursor without templates. Subsequently, dispersed Ag NPs are in situ grown on the porous microparticles via silver mirror reaction. The as-prepared multifunctional catalysts are characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer, X-ray diffraction, thermal gravimetric analysis, and nitrogen adsorption and desorption, respectively. The resultant hybrid microparticles possess microand nano-pores, and exhibit a small hysteresis loop and low coercivity.Meaningfully, they exhibit exceptional catalytic performance for the reduction of 4-nitrophenol in the presence of sodium borohydride and could be reused at least 9 times with excellent stability by means of convenient magnetic separation. The catalyst could be employed to reduce other dyes such as methylene blue, orange G and rhodamine B, and their corresponding reductions follow pseudo-first-order reaction. Therefore, the proposed structure design and scalable route for the synthesis of hierarchical catalyst can pave the way for synthesizing other catalyst systems to address the diverse reaction demands.

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“…Elastic conductors and electric circuits are highly desirable for applications in flexible displays, smart clothing, and actuators . Porous structure of 3D‐CGs provides a great potential of retaining high conductivity of interconnects under substantial degrees of bending, twisting, and stretching deformation to meet the demand of flexible electric applications.…”

Section: Resultsmentioning

confidence: 99%

Interconnected Graphene Networks with Uniform Geometry for Flexible Conductors

Xing

Kong

Wang

et al. 2015

Adv Funct Materials

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Recently lots of strategies have been utilized to construct 3D graphene architectures with specialized morphologies. Due to the great advance of single-crystal carbon architectures in nanoelectronics, a SiC wafer was used to grow designed 3D free standing single-crystal graphene by performing a simple single-step thermal process to meet the potential use in 3D electronic devices. [ 15 ] Because of low cost, high yield, easy scalability, and adjustability, the self-assembly of graphene oxide (GO), which is easily obtained by the oxidation of graphite, has been extensively developed for the fabrication of 3D graphene macroporous structures, such as graphene paper with great rigidity and strength, [ 16 ] honeycomb-like 3D graphene with superior electrical conductivity for supercapacitor application, [ 17 ] and transparent conductive fi bers as conductive wire. [ 18 ] It is noted that these integrated 3D graphene structures present poor electric conductivity due to large structural defects in reduced graphene oxide (rGO) during the peeling and reduction, which limits their practical potentials. In order to obtain high quality 3D graphene with few defects, chemical vapor deposition (CVD) method is believed as an effective way using 3D porous metal as catalysts and templates, such as commercial Ni foams, [ 19 ] Ni nanowires, [ 20 ] templated Ni scaffold originated from polystyrene microspheres, [ 21 ] and Ni mesh. [ 22 ] After the CVD growth, free standing 3D graphene architectures can be acquired by etching of the porous metal catalysts. These 3D graphene architectures possess a monolithic interconnected structure with prominent electrical conductivity, compared to 3D graphene by self-assembly methods. However, the properties of 3D graphene are intensively related to their structures, more effi cient controls of pore sizes and patterns of 3D graphene architectures are needed. Controllable fabrication of 3D graphene architectures with precise dimension and patterns not only manipulates the properties of 3D graphene to meet various demands, but also gives an access to interpret the functional mechanism of 3D graphene at different levels. Nevertheless, controllable fabricating of macroscopic, freestanding 3D graphene architectures has been rarely achieved.In this work, we report a method for fabrication of macroscopic, freestanding 3D controllable graphene (3D-CG) architectures with well-defi ned patterns, pore, and skeleton sizes via CVD, using 3D Ni scaffolds with uniform patterns and sizes as sacrifi cial catalysts. Comparing to structures constructed by selfassembly and other CVD methods, the macroscopic 3D-CGs Interconnected Graphene Networks with Uniform Geometry for Flexible ConductorsMiao Xiao , Tao Kong , Wei Wang , Qin Song , Dong Zhang , Qinqin Ma , and Guosheng Cheng * Controllable construction of graphene into specifi c architectures at macroscopic scales is crucial for practical applications of graphene. An approach of macroscopic and conductive interconnected graphene networks with controllable pattern...

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Layer-by-Layer Assembly of Multifunctional Porous N-Doped Carbon Nanotube Hybrid Architectures for Flexible Conductors and Beyond

Cited by 23 publications

References 40 publications

A facile method to prepare highly compressible three-dimensional graphene-only sponge

A facile method to prepare highly compressible three-dimensional graphene-only sponge

In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis

Interconnected Graphene Networks with Uniform Geometry for Flexible Conductors

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Layer-by-Layer Assembly of Multifunctional Porous N-Doped Carbon Nanotube Hybrid Architectures for Flexible Conductors and Beyond

Cited by 23 publications

References 40 publications

A facile method to prepare highly compressible three-dimensional graphene-only sponge

A facile method to prepare highly compressible three-dimensional graphene-only sponge

In situ synthesis of silver nanostructures on magnetic Fe3O4@organosilicon microparticles for rapid hydrogenation catalysis

Interconnected Graphene Networks with Uniform Geometry for Flexible Conductors

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Product

Resources

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In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis