Electrical characterization of silver nanowire-graphene hybrid films from terahertz transmission and reflection measurements

Dadrasnia, Ehsan; Garet, Frédéric; Lee, Dong Mok; Coutaz, Jean‐Louis; Baik, Seunghyun; Lamela, Horacio

doi:10.1063/1.4889091

Cited by 11 publications

(11 citation statements)

References 32 publications

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“…[25][26][27][28][29][30] In this work the far-field transmittance spectra of our AgNW network was measured using a conventional THz time-domain spectrometer (THz-TDS), schematically represented in Figure 2a. [25][26][27][28][29][30] In this work the far-field transmittance spectra of our AgNW network was measured using a conventional THz time-domain spectrometer (THz-TDS), schematically represented in Figure 2a.…”

Section: Terahertz Far-field Spectroscopymentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

Hoof

Parente

Baldi

et al. 2019

Advanced Optical Materials

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spin-coating to spray-coating, electrospinning, and dip coating. [3,6,7] Furthermore, large-area lithography and metal coating techniques are increasingly emerging as promising alternatives. [8][9][10] However, it is not uncommon for these deposition techniques to result in a conductance that varies spatially due to local modulations in the network thickness or connectivity. These spatial modulations of the electrical conductance are impossible to detect with standard characterization techniques such as the four-point probe method, in which the electrical impedance is measured using a pair of separated electrodes carrying a current and sensing the voltage differences. Furthermore, although microprobes have been developed to map the conductance with high spatial resolution, [11] the four-point probe technique requires electrical contact with the surface, leading to the risk of modifying the sample. These limitations highlight the need for a contact-free and high resolution technique to map electrical conductance over large areas. Broadband and phase sensitive spectroscopic techniques, such as terahertz time-domain spectroscopy (THz-TDS), have emerged as powerful alternatives for probing the complex conductivity of samples. [12][13][14][15] THz-TDS uses very short (single cycle) electromagnetic pulses as low frequency electromagnetic probes to measure the electronic properties. This probing is done by measuring the attenuation and the phase of the THz pulse as it propagates through the medium and interacts (mainly) with free charge carriers. A major advantage of THz-TDS over four-point probe techniques is that it is a contact free technique, which also enables an easy implementation of conductivity scans. The diffraction limit of electromagnetic waves (on the order of the wavelength) defines the maximum spatial resolution that can be attained for the determination of the conductivity using far-field THz techniques. The broadband character of THz-TDS and the standard focusing optics, with relatively low numerical aperture, leads to spatial resolutions on the order of 1 mm or larger.In this manuscript, we synthesize highly monodisperse AgNWs with a diameter of ≈50 nm and a length of ≈10 μm by adapting a polyol method. [16] Subsequently, transparent electrodes are prepared by spray coating the AgNWs solution on top of 25 × 25 mm 2 quartz substrates. The nanowire monodispersity allows us to draw quantitative conclusions from the measurements performed on the conductive networks. We spatially vary the thickness of the AgNWs network across the quartz substrate, and therefore its optical transmission and THz conductance, by adjusting the spray coating conditions. Transparent conductive layers are key components of optoelectronic devices. Here, a polyol method is used to synthesize large quantities of monodisperse silver nanowires (AgNWs) and these are used to fabricate transparent conducting networks over large areas. The optical extinction and terahertz (THz) conductance of these networks are simultaneously investigated,...

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Section: Terahertz Far-field Spectroscopymentioning

confidence: 99%

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

Hoof

Parente

Baldi

et al. 2019

Advanced Optical Materials

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“…Therefore, a great deal of efforts, such as ion doping, intermediate layer insertion and modification of Ti substrate, have been devoted to surmounting this weakness. [23][24][25][26][27][28][29][30][31][32][33][34][35][36] Remarkably, the ions doping (co-doped X-Sb-SnO2 electrodes, X represents Mn, Au, Pt, Ni, rare earth and so on) are one expected and effective strategy. A series of studies on the Ti/X-Sb-SnO2 electrodes have been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…A series of studies on the Ti/X-Sb-SnO2 electrodes have been carried out. [9,28,[33][34][35][37][38][39][40][41][42][43] In recent years, our group has also conducted studies on different metal ion doping. These metals can not only effectively change the concentration of oxygen vacancies in the SnO2 crystal lattice, but also influence the electro-catalytic performance of electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…These metals can not only effectively change the concentration of oxygen vacancies in the SnO2 crystal lattice, but also influence the electro-catalytic performance of electrodes. [28,29,[33][34][35] For examples, we studied the Mn-Sb and Cr-Sb co-doped Ti/Sb-SnO2 electrodes with a range of physicochemical and electrochemical treatments. [28,29] The Ti/Mn-Sb-SnO2 electrode presented the most stable electro-catalytic activity and the lowest resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Results showed that the Ti/Sb-SnO2 electrode doped with Ni had a superior electrical conductivity and a high oxygen evolution potential. [35] It is well known that Pt is a chemically stable material with excellent catalytic property, which is expected to improve the performance of Ti/Sb-SnO2 electrodes effectively used as a doping element from an electrochemical and physicochemical point of view. Recently, some researchers have studied the Ti/Sb-SnO2 anodes by introducing a small amount of Pt (Ti/Pt-Sb-SnO2 anodes), which can improve the performance of Ti/Sb-SnO2 electrodes effectively.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol

Li¹,

Yan²,

Zhu³

2021

Eng. Sci.

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An optimized metal oxide electrode was prepared via the simple thermal decomposition method to improve the stability and electro-catalytic properties. It was found that Pt doping could effectively change the surface morphology. The Ti/Pt-Sb-SnO2 electrode possess compact and uniform surface packed with a large number of small particles. Besides, the influence of the Pt on the electrochemical performance was analyzed in detail. The oxygen evolution potential of Ti/Pt-Sb-SnO2 electrode decreased slightly, but it showed a smaller charge transfer resistance (0.2 Ω•cm 2 versus 1.67 Ω•cm 2 ) and a longer service lifetime which is almost 24-times longer than that of Ti/Sb-SnO2 (73 h versus 3h). Finally, electro-catalytic oxidation of phenol was employed. In the electro-catalytic process, both phenol and its possible intermediates were more rapidly decomposed on the Ti/Pt-Sb-SnO2 electrodes. The removal of chemical oxygen demand (COD) was 95.56% and 56.31% on the Ti/Pt-Sb-SnO2 and Ti/Sb-SnO2 electrodes, respectively. And the corresponding instantaneous current efficiency (ICE) of Ti/Pt-Sb-SnO2 electrode was higher than that of Ti/Sb-SnO2. Based on the experimental results, the prepared Ti/Pt-Sb-SnO2 electrode has better stability and excellent phenol electro-catalytic ability, further signifying that it has a good potential application prospect in the field of wastewater.

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Noncontact techniques

Sousa¹,

Ventura²,

Pereira³

2021

Transport Phenomena in Micro- And Nanoscale Functional Materials and Devices

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Electrical characterization of silver nanowire-graphene hybrid films from terahertz transmission and reflection measurements

Cited by 11 publications

References 32 publications

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

Terahertz Time‐Domain Spectroscopy and Near‐Field Microscopy of Transparent Silver Nanowire Networks

Fabrication and Characterization of Pt doped Ti/Sb-SnO2 Electrode and its Efficient Electro-Catalytic Activity toward Phenol

Noncontact techniques

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