Free-standing, anti-corrosion, super flexible graphene oxide/silver nanowire thin films for ultra-wideband electromagnetic interference shielding

Jia, Hui; Yang, Xiaona; Kong, Qingqiang; Xie, Lingling; Guo, Quangui; Song, Ge; Leilei, Liang; Chen, Jing-Peng; Yan, Li; Chen, Cheng-Meng

doi:10.1039/d0ta09246k

Cited by 66 publications

(42 citation statements)

References 54 publications

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“…dep, 100 111 100 100 111 (8) where N i is the number of deposited atoms within a time t and R dep,i is the deposition rate, both on facet i. Also, R dep = R dep,{111} + R dep,{100} .…”

Section: Resultsmentioning

confidence: 99%

“…Penta-twinned metal nanowires are finding applications in many different technologies, ranging from health monitoring and human-machine interfaces − to smart fabrics − to windows that provide shielding from electromagnetic interference, , change color or tint in response to light, and are self-heating . These nanowires are beneficial for catalysis and applications in transparent and flexible electronics, such as touch screens and various elements of solar cells.…”

Section: Introductionmentioning

confidence: 99%

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Solution-Phase Growth of Cu Nanowires with Aspect Ratios Greater Than 1000: Multiscale Theory

2021

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Penta-twinned metal nanowires are finding widespread application in existing and emerging technologies. However, little is known about their growth mechanisms. We probe the origins of chloride- and alkylamine-mediated, solution-phase growth of penta-twinned Cu nanowires from first-principles using multiscale theory. Using quantum density functional theory (DFT) calculations, we characterize the binding and surface diffusion of Cu atoms on chlorine-covered Cu(100) and Cu(111) surfaces. We find stronger binding and slower diffusion of Cu atoms on chlorinated Cu(111) than on chlorinated Cu(100), which is a reversal of the trend for bare Cu surfaces. We also probe interfacet diffusion and find that this proceeds faster from Cu(100) to Cu(111) than the reverse. Using the DFT rates for hopping between individual sites at Ångstrom scales, we calculate coarse-grained, interfacet rates for nanowires of various lengthsup to hundreds of micrometersand diameters in the 10 nm range. We predict nanowires with aspect ratios of ∼100, based on surface diffusion alone. We also account for the influence of a self-assembled alkylamine layer that covers most of the {100} facets, but is absent or thin and disordered on the {111} facets and in an “end zone” near the {100}/{111} boundary. With an end zone, we predict a wide range of nanowire aspect ratios in the experimental ranges. Our work reveals the mechanisms by which a halidechloridepromotes the growth of high-aspect-ratio nanowires.

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“…dep, 100 111 100 100 111 (8) where N i is the number of deposited atoms within a time t and R dep,i is the deposition rate, both on facet i. Also, R dep = R dep,{111} + R dep,{100} .…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solution-Phase Growth of Cu Nanowires with Aspect Ratios Greater Than 1000: Multiscale Theory

2021

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“…After the treatment of electroless plating, the films covered with crescent Ni–P exhibit rapidly decreasing resistivity, and the σ of CONF-1, CONF-2, and CONF-3 progressively grow to 10, 33, and 125 S m −1 , respectively. In view of close correlation between σ and EMI shielding performance, the total shielding effectiveness (SE T ) in X-band inherits a similar tendency with σ, which is also explained with Simon's formula [ 56 ]. From Fig.…”

Section: Resultsmentioning

confidence: 99%

Heterointerface Engineering of β-Chitin/Carbon Nano-Onions/Ni–P Composites with Boosted Maxwell-Wagner-Sillars Effect for Highly Efficient Electromagnetic Wave Response and Thermal Management

Pan

Cai

et al. 2022

Nano-Micro Lett.

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The rational construction of microstructure and composition with enhanced Maxwell-Wagner-Sillars effect (MWSE) is still a challenging direction for reinforcing electromagnetic wave (EMW) absorption performance, and the related EMW attenuation mechanism has rarely been elucidated. Herein, MWSE boosted β-chitin/carbon nano-onions/Ni–P composites is prepared according to the heterointerface engineering strategy via facile layer-by-layer electrostatic assembly and electroless plating techniques. The heterogeneous interface is reinforced from the aspect of porous skeleton, nanomaterials and multilayer construction. The composites exhibit competitive EMW response mechanism between the conductive loss and the polarization/magnetic loss, as describing like the story of “The Hare and the Tortoise”. As a result, the composites not only achieve a minimum reflection loss (RLmin) of − 50.83 dB and an effective bandwidth of 6.8 GHz, but also present remarkable EMW interference shielding effectiveness of 66.66 dB. In addition, diverse functions such as good thermal insulation, infrared shielding and photothermal performance were also achieved in the hybrid composites as a result of intrinsic morphology and chemicophysics properties. Therefore, we believe that the boosted MWSE open up a novel orientation toward developing multifunctional composites with high-efficient EMW response and thermal management.

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“…In parallel, heart rate monitoring can also be accomplished based on stretchable electrodes such as silver nanowires and graphene oxide, via pressure/strain‐resistance variation sensing. [ 32–35 ] Compared to these closely‐contacted mechanoelectrical sensing scheme, the flexible a‐SiGe:H PDs@AF devices demonstrated here provide a more comfortable and complimentary routine to probe directly the contraction/expansion dynamics of the arterial blood vessels. More importantly, the a‐SiGe:H PDs boast a faster response that could enable more advanced real‐time PPG analysis.…”

Section: Resultsmentioning

confidence: 99%

Flexible and Robust 3D a‐SiGe Radial Junction Near‐Infrared Photodetectors for Rapid Sphygmic Signal Monitoring

Zhang

Liu

et al. 2021

Adv Funct Materials

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Flexible near‐infrared (NIR) photodetectors (PDs) are desired for accurate heart rate monitoring, based directly on arterial‐blood‐volume‐change detection, instead of indirect oximetry technology. In this work, a robust 3D construction of flexible a‐SiGe:H p‐i‐n radial junction (RJ) PDs is explored directly upon soft Al foils, working at NIR wavelength 800 nm, which has the highest skin transparency and the least absorption difference from oxyhemoglobin and deoxyhemoglobin variation. The 3D a‐SiGe:H RJ‐PDs demonstrate excellent flexibility and mechanical stability that can undergo 1000‐times bending to 10 mm radius, with a high responsivity of ≈140 mA W−1@800 nm and rise/fall time scales of 5.4 µs/17.6 µs (3.6 µs/13.2 µs before bending). Successful photoplethysmography (PPG) detection of sphygmic signals is achieved at the wrist with significant arterial blood volume changes, working in reflectance mode and using a single NIR source @800 nm. These unique capabilities, enabled by the a‐SiGe:H RJ, have a promising potential to establish a reliable and convenient PPG detection technology, which can help to extract the heartbeat via solely arterial blood volume change, as a complementary and potentially very useful new diagnostic dimension for efficient and accurate real‐time health monitoring.

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Free-standing, anti-corrosion, super flexible graphene oxide/silver nanowire thin films for ultra-wideband electromagnetic interference shielding

Abstract: The exploration of ultra-wideband electromagnetic shielding materials is still a huge challenge to eliminate electromagnetic interference from various frequencies electronic devices in military and civil fields. Herein, a free-standing graphene...

Cited by 66 publications

References 54 publications

Solution-Phase Growth of Cu Nanowires with Aspect Ratios Greater Than 1000: Multiscale Theory

Solution-Phase Growth of Cu Nanowires with Aspect Ratios Greater Than 1000: Multiscale Theory

Heterointerface Engineering of β-Chitin/Carbon Nano-Onions/Ni–P Composites with Boosted Maxwell-Wagner-Sillars Effect for Highly Efficient Electromagnetic Wave Response and Thermal Management

Flexible and Robust 3D a‐SiGe Radial Junction Near‐Infrared Photodetectors for Rapid Sphygmic Signal Monitoring

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