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Sandwich-like Polypyrrole/Reduced Graphene Oxide Nanosheets Integrated Gelatin Hydrogel as Mechanically and Thermally Sensitive Skinlike Bioelectronics
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-30 , DOI: 10.1021/acssuschemeng.0c01998 Xule Yang 1 , Liqin Cao 1 , Jide Wang 1 , Liuping Chen 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-30 , DOI: 10.1021/acssuschemeng.0c01998 Xule Yang 1 , Liqin Cao 1 , Jide Wang 1 , Liuping Chen 2
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Currently, conductive composite hydrogels are promising alternatives for skinlike sensors. Generally, graphene as well as its derivatives and conducting polymers (CPs), such as polypyrrole (PPy), are employed as functional fillers, which critically hinge on simultaneously comprising skinlike mechanical compliance, high sensitivity for multistimuli, and ease of processing. Herein, to fully couple the superiorities of graphene nanosheets and CPs, sandwich-like PPy–rGO–PPy nanosheets were synthesized via a facile universal interface self-assembly reaction, which was an auto-redox reaction with Py as reductants and graphene oxide (GO) as oxidants, and were facilitated by hydrothermal treatment. The as-synthesized nanohybrids came out to be ultrathin (5 nm), flexible, surface wrinkled, and compliant with a large specific surface area, containing PPy-rich (over 50 wt %) and reduced GO, which are highly conductive (100 S m–1). Natural gelatin was used as the flexible supporting matrix to enable the good dispersion of PPy–rGO–PPy nanosheets into the composite hydrogel, which exhibits skinlike mechanical compliance. Indeed, the incorporated PPy–rGO–PPy nanosheets provide the composite hydrogel with a stable conducting network and can perceive and instantly convert multistimuli into electric signal variations. As expected, these hydrogel-based sensors delivered high strain sensitivity (gauge factor ≥ 1.98) within the strain range of 0–200%, low limit of detection (≤0.1% strain), excellent pressure perception (S = −3.573%/kPa) within the pressure range of 0–10 kPa, and superior thermosensation (temperature coefficient of resistance = −1.288%/°C) within the range of human body temperature variations (35–40 °C) and perceptible temperature range (20–80 °C). Moreover, these sensors applied to monitor human body movements and simulate human body thermoperception display highly reliable electrical signal read-outs. Finally, the self-structured sandwich-like PPy–rGO–PPy nanosheets as functional fillers in the conductive composite hydrogel are relatively economical in methodology, novel in material combination, and processed with ease, which will allow for relatively low cost and scaled-up preparations of flexible bioelectronics and biosensors.
中文翻译：
三明治式聚吡咯/还原氧化石墨烯纳米片集成明胶水凝胶作为机械和热敏性皮肤生物电子学
目前，导电复合水凝胶有望成为皮肤传感器的替代品。通常，石墨烯及其衍生物和导电聚合物（CPs），例如聚吡咯（PPy），被用作功能性填充剂，它们同时具有皮肤般的机械柔韧性，对多种刺激的高敏感性以及易于加工的特性，因此至关重要。在本文中，为了充分发挥石墨烯纳米片和CP的优势，通过一种简便的通用界面自组装反应合成了三明治状的PPy–rGO–PPy纳米片，这是一种以Py为还原剂和氧化石墨烯（GO）的自氧化还原反应。 ）作为氧化剂，并通过水热处理得以促进。合成后的纳米杂化物具有超薄（5 nm）的特性，柔韧性，表面起皱并且符合较大的比表面积，–1）。天然明胶被用作柔性支撑基质，以使PPy–rGO–PPy纳米片良好地分散到复合水凝胶中，表现出类似于皮肤的机械柔韧性。实际上，并入的PPy–rGO–PPy纳米片为复合水凝胶提供了稳定的导电网络，并且可以感知并立即将多种刺激转化为电信号变化。正如预期的那样，这些基于水凝胶的传感器在0-200％的应变范围内具有较高的应变灵敏度（应变系数≥1.98），较低的检测下限（≤0.1％应变），出色的压力感（S在0–10 kPa的压力范围内= −3.573％/ kPa，在人体温度变化（35–40°C）范围内且可感知的情况下具有出色的热感（电阻温度系数= −1.288％/°C）温度范围（20–80°C）。此外，这些传感器可用于监视人体运动并模拟人体热感知，从而显示高度可靠的电信号读数。最后，在导电复合水凝胶中作为功能性填料的自结构三明治状PPy–rGO–PPy纳米片在方法上相对经济，材料组合新颖且易于加工，这将使成本相对较低且规模扩大柔性生物电子学和生物传感器的制备。
更新日期：2020-07-27
中文翻译：
三明治式聚吡咯/还原氧化石墨烯纳米片集成明胶水凝胶作为机械和热敏性皮肤生物电子学
目前，导电复合水凝胶有望成为皮肤传感器的替代品。通常，石墨烯及其衍生物和导电聚合物（CPs），例如聚吡咯（PPy），被用作功能性填充剂，它们同时具有皮肤般的机械柔韧性，对多种刺激的高敏感性以及易于加工的特性，因此至关重要。在本文中，为了充分发挥石墨烯纳米片和CP的优势，通过一种简便的通用界面自组装反应合成了三明治状的PPy–rGO–PPy纳米片，这是一种以Py为还原剂和氧化石墨烯（GO）的自氧化还原反应。 ）作为氧化剂，并通过水热处理得以促进。合成后的纳米杂化物具有超薄（5 nm）的特性，柔韧性，表面起皱并且符合较大的比表面积，–1）。天然明胶被用作柔性支撑基质，以使PPy–rGO–PPy纳米片良好地分散到复合水凝胶中，表现出类似于皮肤的机械柔韧性。实际上，并入的PPy–rGO–PPy纳米片为复合水凝胶提供了稳定的导电网络，并且可以感知并立即将多种刺激转化为电信号变化。正如预期的那样，这些基于水凝胶的传感器在0-200％的应变范围内具有较高的应变灵敏度（应变系数≥1.98），较低的检测下限（≤0.1％应变），出色的压力感（S在0–10 kPa的压力范围内= −3.573％/ kPa，在人体温度变化（35–40°C）范围内且可感知的情况下具有出色的热感（电阻温度系数= −1.288％/°C）温度范围（20–80°C）。此外，这些传感器可用于监视人体运动并模拟人体热感知，从而显示高度可靠的电信号读数。最后，在导电复合水凝胶中作为功能性填料的自结构三明治状PPy–rGO–PPy纳米片在方法上相对经济，材料组合新颖且易于加工，这将使成本相对较低且规模扩大柔性生物电子学和生物传感器的制备。
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