Page 102 - 《精细化工》2022年第8期
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·1602·                            精细化工   FINE CHEMICALS                                 第 39 卷

                                                               的弱黏附力     [16] ,裸银纳米线电极中的纳米线在机械
                                                               弯曲过程中发生滑移,导致线结处接触不良甚至断
                                                               开,使得电阻上升。而复合电极中的导电网络半嵌
                                                               入聚合物膜,增大了导电网络与基底之间的附着力,
                                                               减小了滑移程度,因此,电阻变化较小,复合电极
                                                               表现出更好的机械柔韧性。

            图 8   电极的薄层电阻与时间的关系曲线(a);裸银纳米
                  线电极(b)和复合电极(c)置于恒温恒湿箱中                       3   结论
                  12 d 后的 SEM 图
            Fig. 8    Relationship between  sheet resistance of electrode   通过在裸银纳米线电极表面涂覆一层质量分数
                   and time (a); SEM images of bare silver nanowire   为 0.50%的纤维素溶液,于室温下将裸银纳米线电极
                   electrodes (b) and composite electrodes (c) placed   (透光率为 87.7%)的初始薄层电阻从 27.0 Ω/sq 降低
                   in a constant temperature and humidity chamber for
                   12 d                                        至 14.0 Ω/sq,制备成的 HEC-AgNWs-PET 复合透明
                                                               电极几乎无透光率损失,该法工艺简单,具有普适
            2.6   HEC-AgNWs-PET 复合电极的机械柔韧性
                                                               性且易于放大生产。纤维素溶液成膜过程中,银纳
                 在电极使用过程中,电极的机械柔韧性与电化
                                                               米线导电网络由松散堆积变得致密紧实,线结处形
            学稳定性同样重要,因而,在循环弯曲下对其电阻
                                                               成更多的有效接触点,降低了电极的薄层电阻。纤
            进行测试。图 9a、b 为初始薄层电阻为 15 Ω/sq 的裸
                                                               维素纳米膜填充了导电网络的空隙,改善了电极表
            银纳米线电极与复合电极在 2500 次内外弯曲循环                          面的粗糙度。复合电极表面的导电网络呈现半嵌入
            中的电阻变化。结果表明,内弯曲测试 2500 次循环
                                                               的形态,提高了电极的机械稳定性与化学稳定性。
            后,裸银纳米线电极与复合电极的电阻分别变为原
            来的 1.56 倍与 1.36 倍。外弯曲测试 2500 次循环后,                 参考文献:
            裸银纳米线电极与复合电极的电阻分别变为原来的                             [1]   WANG  Z  X, JIAO B, QING Y C,  et al. Flexible and transparent
                                                                   ferroferric oxide-modified silver nanowire film for efficient electromagnetic
            2.35 倍与 1.46 倍。
                                                                   interference shielding[J]. ACS Applied Materials Interfaces, 2020,
                                                                   12(2): 2826-2834.
                                                               [2]   KANG H, KANG I, HAN J, et al. Flexible and mechanically robust
                                                                   organic  light-emitting diodes based  on photopatternable  silver
                                                                   nanowire electrodes[J]. The Journal of Physical Chemistry C, 2016,
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                                                               [3]   ZHENG B D, ZHU Q S, ZHAO Y, et al. Fabrication of high-quality
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                                                                   film heaters[J]. Journal of Materials Science & Technology, 2021, 71:
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                                                               [4]   LIU  J, ZHANG L,  LI C Z,  et al.  Highly stable, transparent, and
                                                                   conductive electrode of solution-processed silver nanowire-mxene
                                                                   for flexible alternating-current electroluminescent devices[J]. Industrial
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                                                               [5]   LI Y X (李禹欣), HU F (胡飞). Synthesis and properties of starch
                                                                   substrate silver  nanowires flexible transparent conductive films[J].
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                                                               [6]   LU H F, ZHANG D, REN X G, et al. Selective growth and integration of
                                                                   silver nanoparticles on silver nanowires at room conditions for transparent
                                                                   nano-network electrode[J]. ACS Nano, 2014, 8(10): 10980-10987.
                                                               [7]   LEE S J, KIM Y H, KIM J K, et al. A roll-to-roll welding process for
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                                                                   nanowire mesh transparent electrodes[J]. Nano Letters, 2008, 8(2):
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                                                               [9]   PARK J H, HWANG G T, KIM S, et al. Flash-induced self-limited
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              图 9   电极内弯曲(a)和外弯曲(b)循环测试曲线
                                                                   energy harvester[J]. Advanced Materials, 2017, 29(5): 1603473.
            Fig. 9    Cyclic test curves of electrode inner bending (a) and   [10]  SONG T B, CHEN Y, CHUNG C H, et al. Nanoscale joule heating
                   outer bending (b)                               and electromigration enhanced ripening of silver nanowire contacts[J].
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                 由于银纳米线的松散堆积以及导电网络与基底                                                        (下转第 1611 页)
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