Silver‐coated copper nanowires with improved anti‐oxidation property as conductive fillers in low‐density polyethylene

Luo, Xiaoxiong; Gelves, Genaro A.; Sundararaj, Uttandaraman; Luo, Jing‐Li

doi:10.1002/cjce.21701

Cited by 27 publications

(20 citation statements)

References 40 publications

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“…12 However, CuNWs are very sensitive to oxygen that greatly hinders their developments. Althrough coating a thin layer of materials (Ni, [13][14][15][16] Pt, 17,18 Au, 13,19 Zn, 20 Sn, 20 Ag, 21,22 AZO, 23 carbon materials, 24-27 et al) on CuNWs is an effective way to prevent the oxidation of CuNWs, these methods are usually electrodeposition methods, chemical or physical vapor deposition (CVD or PVD), one pot or two pot method at high temperature (210 °C), et al It is highly dependent on the costly equipments and rigorous reaction conditions, which are not advantageous in wide applications in industry (see the summary of core-shell NWs based on CuNWs in Table S2). Flexible polymer matrix (such as polydimethylsiloxane (PDMS), polyurethane (PU) elastomer, styrene-butadiene-styrene (SBS) elastomer) plays a key role in determining the shape and elasticity of e-skin.…”

Section: Introductionmentioning

confidence: 99%

Cu–Ag core–shell nanowires for electronic skin with a petal molded microstructure

et al. 2015

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Flexible electronic skin (e-skin) have been widely researched due to their potential applications in wearable electronics, robotic systems, biomedicines, et al. For realization of lower cost of the e-skin, copper nanowires (CuNWs) are often served as conductive fillers since their high conductivity and flexibility. However, CuNWs are very sensitive to oxygen that greatly hinders their developments. To solve this issue, a facile galvanic replacement reaction without any heating, stirring or dispersant was performed to coat a thin layer of silver (20 nm) on the surface of CuNWs and Cu-Ag core-shell nanowires (Cu-Ag NWs) with excellent oxidation resistance were obtained and served as conductive fillers for e-skin. To further increase the sensitivity and reduce the response time and detection limit, micro-structure of the surface of rose petal was replicated and introduced onto 2D polydimethylsiloxane (PDMS) surface. The bio-inspired piezoresistive e-skin demonstrates high sensitivity (1.35 kPa -1 ), very low detection limit (< 2 Pa), very low response time and relaxation time (36 ms and 30 ms) and outstanding working stability (more than 5000 cycles). The high performance e-skin has extensive applications in voice recognition, wrist pulses monitoring and detection of spatial distribution of pressure.−1 ), fast response (<500 ms) and low detection limit (20 mg). 29 Wang, et al. replicated the surface of silk and constructed a piezoresistive e-skin, which can be used as voice The defining feature of our design is that the length of the CuNWs should not larger than 20 μm. Therefore, a lower EDA concentration (95 mM) and shorter reaction time (<1.0 h) was performed to synthesis shorter CuNWs. Fig.1a and b show the

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Section: Introductionmentioning

confidence: 99%

Cu–Ag core–shell nanowires for electronic skin with a petal molded microstructure

et al. 2015

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“…However, the resistivity of such film was 3.1 times higher than pure CuNWs, due to the intrinsically higher resistivity of nickel. Luo et al 18 demonstrated the synthesis of the CuNWs surrounded by a silver shell (AgCuNWs), but silver is an expensive metal. The surface passivation of electrospun copper nanofibers with double layers of transparent aluminum-doped zinc oxide (AZO)/Al 2 O 3 has been performed by atomic layer deposition, yielding a sheet resistance of 47.1 O sq À1 and transmittance of 80% at 550 nm.…”

Section: Introductionmentioning

confidence: 99%

Annealing-free fabrication of highly oxidation-resistive copper nanowire composite conductors for photovoltaics

et al. 2014

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Copper nanowire (CuNW)-network film is a promising alternative to the conventional indium tin oxide (ITO) as a transparent conductor. However, thermal instability and the ease of oxidation hinder the practical applications of CuNW films. We present oxidation-resistive CuNW-based composite electrodes that are highly transparent, conductive and flexible. Lactic acid treatment effectively removes both the organic capping molecule and the surface oxide/hydroxide from the CuNWs, allowing direct contact between the nanowires. This chemical approach enables the fabrication of transparent electrodes with excellent properties (19.8 X sq À1 and 88.7% at 550 nm) at room temperature without any atmospheric control. Furthermore, the embedded structure of CuNWs with Al-doped ZnO (AZO) dramatically improves the thermal stability and oxidation resistance of CuNWs. These AZO/CuNW/AZO composite electrodes exhibit high transparency (83.9% at 550 nm) and low sheet resistance (35.9 X sq À1 ), maintaining these properties even with a bending number of 1280 under a bending radius of 2.5 mm. When implemented in a Cu(In 1 Àx ,Gax)(S,Se) 2 thin-film solar cell, this composite electrode demonstrated substantial potential as a low-cost (Ag-, In-free), high performance transparent electrode, comparable to a conventional sputtered ITO-based solar cell. NPG Asia Materials (2014) 6, e105; doi:10.1038/am.2014.36; published online 13 June 2014Keywords: chemical reduction treatment; copper nanowire; indium-free transparent electrodes; photovoltaic; thermal oxidation resistance INTRODUCTION Transparent conductive materials are a crucial, basic element in the realization of various optoelectronic devices, such as flat panel displays, touch screens, organic light emitting diodes and thin-film solar cells. 1-3 Indium tin oxide (ITO) has been the most widely explored material, because of its excellent transparency (B90% at 550 nm) and low sheet resistance (B20 O sq À1 ). However, with the rising demand for transparent electrodes, the development of cost-effective alternatives to ITO has been of great importance. The quest for alternative transparent conductors, including conducting polymers, carbon nanotubes, graphenes and nanostructured electrodes, has been a topic of active research for the last decade. 4 Among these materials, metal-nanowire network films are thought to be a substantial candidate. The metallic nanowire film is capable of providing high transparency and conductivity by virtue of its characteristic structure, which consists of a percolated random network of nanowires. [5][6][7][8][9] Unlike the brittle metal oxide skeletonbased ITO, metal-nanowire films are easily applicable to bendable, wearable active devices, because of the inherently flexible nature of metals. A high aspect ratio is a critical factor for high transparency and conductivity, but metal nanowires possessing this quality suffer

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“…Our study contributes to the understanding of the oxidation mechanism of Cu nanowires and serves as a useful background for applications in e.g. catalysis [26][27][28] and sensors, [28][29][30][31][32] and can help in designing new Cu based nanomaterials for electronics [33][34][35][36][37].…”

Section: Discussionmentioning

confidence: 99%

Native oxide formation on pentagonal copper nanowires: A TEM study

2018

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Hydrothermally synthesized copper nanowires were allowed to oxidize in air at room temperature and 30% constant humidity for the period of 22 days. The growth of native oxide layer was followed up by high-resolution transmission electron microscopy and diffraction to reveal and understand the kinetics of the oxidation process. Copper oxides appear in the form of differently oriented crystalline phases around the metallic core as a shell-like layer (Cu 2 O) and as nanoscopic islands (CuO) on the top of that. Time dependent oxide thickness data suggests that oxidation follows the field-assisted growth model at the beginning of the process, as practically immediately an oxide layer of ∼2.8 nm thickness develops on the surface. However, after this initial rapid growth, the local field attenuates and the classical parabolic diffusion limited growth plays the main role in the oxidation. Because of the single crystal facets on the side surface of penta-twinned Cu nanowires, the oxidation rate in the diffusion limited regime is lower than in polycrystalline films.

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Silver‐coated copper nanowires with improved anti‐oxidation property as conductive fillers in low‐density polyethylene

Cited by 27 publications

References 40 publications

Cu–Ag core–shell nanowires for electronic skin with a petal molded microstructure

Cu–Ag core–shell nanowires for electronic skin with a petal molded microstructure

Annealing-free fabrication of highly oxidation-resistive copper nanowire composite conductors for photovoltaics

Native oxide formation on pentagonal copper nanowires: A TEM study

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