Reduced Graphene Oxide Conformally Wrapped Silver Nanowire Networks for Flexible Transparent Heating and Electromagnetic Interference Shielding
Reduced Graphene Oxide Conformally Wrapped Silver Nanowire Networks for Flexible Transparent Heating and Electromagnetic Interference Shielding
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还原氧化石墨烯保形包裹银纳米线网络，用于灵活透明加热和电磁干扰屏蔽
DOI：
10.1021/acsnano.0c03337
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发表时间：
2020-07-28
期刊：
影响因子：
17.1
通讯作者：
Liu, Yichun
中科院分区：
文献类型：
--
作者：
Yang, Yang;Chen, Sai;Liu, Yichun
金属纳米线网络（MNNs）是一种很有前途的透明电极材料，可用于各种光电器件，也可作为电加热和电磁干扰（EMI）屏蔽应用的活性材料。然而，mnn相对较低的性能和较差的耐久性限制了其实际应用。在这里，我们报告了一种可控的方法来增强MNNs的导电性和稳定性，同时保持其透光率不变，其中通过选择性电沉积氧化石墨烯纳米片在AgNWs上，然后进行脉冲激光照射处理，合成还原氧化石墨烯共形包裹的银纳米线网络（AgNW@rGO网络）。实验表征和时域有限差分模拟表明，特定波长的脉冲激光照射不仅可以减少氧化石墨烯，还可以通过表面等离子体共振过程将AgNWs焊接在一起。结果表明，AgNWprGO网络的片电阻低，为3.3 ω /平方，平均透过率为91.1%，具有良好的柔韧性。由于有效地抑制了表面银原子的氧化和迁移，用还原氧化石墨烯包裹提高了AgNW网络透明加热器的最高电加热温度。此外，在8.2-12.4 GHz频率范围内，由于双重反射、传导损耗和多重介电极化弛豫过程的综合作用，获得了高达35.5 dB的优异EMI屏蔽效果。
Metal nanowire networks (MNNs) are promising as transparent electrode materials for a diverse range of optoelectronic devices and also work as active materials for electrical heating and electromagnetic interference (EMI) shielding applications. However, the relatively low performance and poor durability of MNNs are limiting the practical application of the resulting devices. Here, we report a controllable approach to enhance the conductivity and the stability of MNNs with their transmittance remaining unchanged, in which reduced graphene oxide conformally wrapped silver nanowire networks (AgNW@rGO networks) are synthesized by selective electrodeposition of GO nanosheets on AgNWs followed by a pulsed laser irradiation treatment. Experimental characterizations and finite-difference time-domain simulations indicate that pulsed laser irradiation at a specific wavelength not only reduces the GO but also welds the AgNWs together through a surface plasmon resonance process. As a result, the AgNWprGO networks exhibit low sheet resistance of 3.3 Omega/square, average transmittance of 91.1%, and good flexibility. Wrapping with rGO improves the maximum electrical heating temperature of the AgNW network transparent heaters due to the effective suppression of the oxidation and the migration of surface silver atoms. In addition, excellent EMI shielding effectiveness of up to 35.5 dB in the 8.2-12.4 GHz frequency range is obtained as a consequence of the combined effects of dual reflection, conduction loss, and multiple dielectric polarization relaxation processes.