研究纳米石墨烯整理针织物的防电磁辐射性能。采用聚(4-苯乙烯磺酸钠)作为聚阴离子,壳聚糖作为聚阳离子,将石墨烯纳米片均匀掺杂在壳聚糖溶液中,通过静电吸附层层自组装技术对针织物进行涂层整理。通过扫描电子显微镜和X射线光电子能谱...研究纳米石墨烯整理针织物的防电磁辐射性能。采用聚(4-苯乙烯磺酸钠)作为聚阴离子,壳聚糖作为聚阳离子,将石墨烯纳米片均匀掺杂在壳聚糖溶液中,通过静电吸附层层自组装技术对针织物进行涂层整理。通过扫描电子显微镜和X射线光电子能谱表征分析改性针织物的表观形态和化学组分;采用双轴传输线法评估其电磁屏蔽效能。结果表明:随整理针织物涂覆石墨烯质量分数的增加,导电性逐渐增强,电磁屏蔽(SE)值逐渐增大。当石墨烯质量分数为7.2%时,其SE值达到31 d B,远远超出商业应用所需的20 d B防护水平。展开更多
多功能柔性二氧化锰/还原氧化石墨烯碳化棉织物(MnO_2/rGO@C)在本文中得以制备。为赋予棉织物多重功用,先将棉织物浸于GO分散液中,然后采用原位溶液沉积法将纳米MnO_2粒子结合于GO-棉织物表面,并通过碳化工艺获得最终多功能导电碳化产...多功能柔性二氧化锰/还原氧化石墨烯碳化棉织物(MnO_2/rGO@C)在本文中得以制备。为赋予棉织物多重功用,先将棉织物浸于GO分散液中,然后采用原位溶液沉积法将纳米MnO_2粒子结合于GO-棉织物表面,并通过碳化工艺获得最终多功能导电碳化产品。采用SEM,XRD,ICP测试和元素分析对碳化织物的微观结构形态及组成成分进行表征,并就其电-化学性能和电-机械性能进行评估与研究。结果显示,在电流密度为100 mA/g时,MnO_2/rGO@C的比电容可达329.4 mA h/g,比未经MnO_2/rGO整理的碳化纯棉织物高40%以上。此外,MnO_2/rGO@C还展现出优良和可重复的电-机械性能,应变恒定,在曲率为0.6cm-1时,其标准电阻(RR0)/R0可达0.78。MnO_2/rGO@C织物用途广泛,可规模化生产,并能适应多种智能纺织品的应用。展开更多
Flexible piezoresistive pressure sensors can offer convenient detection of mechanical deformations for wearable electronics.Previous studies of flexible piezoresistive pressure sensors focus on the sensitivity but the...Flexible piezoresistive pressure sensors can offer convenient detection of mechanical deformations for wearable electronics.Previous studies of flexible piezoresistive pressure sensors focus on the sensitivity but the low-cost and self-powered sensors remain a challenge due to the deviation of resistance signal acquisition caused by thermoelectric voltage.Here,piezoresistive pressure sensors with ultralow Seebeck coefficient of-0.72μV/K based on carbon nanotubes(CNTs)/polyethyleneimine(PEI)/melamine(CPM)sponge are reported.Due to the diminished Seebeck effect,the CPM sponge pressure sensors successfully reduce the deviation to 18.75%and can keep stable sensitivity and resistance change under a very low working voltage and change temperature environment.The stable properties of the sensors make them successful to work for real-time sensing in self-powered wearable electronics.展开更多
文摘研究纳米石墨烯整理针织物的防电磁辐射性能。采用聚(4-苯乙烯磺酸钠)作为聚阴离子,壳聚糖作为聚阳离子,将石墨烯纳米片均匀掺杂在壳聚糖溶液中,通过静电吸附层层自组装技术对针织物进行涂层整理。通过扫描电子显微镜和X射线光电子能谱表征分析改性针织物的表观形态和化学组分;采用双轴传输线法评估其电磁屏蔽效能。结果表明:随整理针织物涂覆石墨烯质量分数的增加,导电性逐渐增强,电磁屏蔽(SE)值逐渐增大。当石墨烯质量分数为7.2%时,其SE值达到31 d B,远远超出商业应用所需的20 d B防护水平。
文摘多功能柔性二氧化锰/还原氧化石墨烯碳化棉织物(MnO_2/rGO@C)在本文中得以制备。为赋予棉织物多重功用,先将棉织物浸于GO分散液中,然后采用原位溶液沉积法将纳米MnO_2粒子结合于GO-棉织物表面,并通过碳化工艺获得最终多功能导电碳化产品。采用SEM,XRD,ICP测试和元素分析对碳化织物的微观结构形态及组成成分进行表征,并就其电-化学性能和电-机械性能进行评估与研究。结果显示,在电流密度为100 mA/g时,MnO_2/rGO@C的比电容可达329.4 mA h/g,比未经MnO_2/rGO整理的碳化纯棉织物高40%以上。此外,MnO_2/rGO@C还展现出优良和可重复的电-机械性能,应变恒定,在曲率为0.6cm-1时,其标准电阻(RR0)/R0可达0.78。MnO_2/rGO@C织物用途广泛,可规模化生产,并能适应多种智能纺织品的应用。
基金Fundamental Research Fund for the Central Universities,China(Nos.2232020G-01 and 19D110106)Young Elite Scientists Sponsorship Program by China Association for Science and Technology,China(No.2017QNRC001)Graduate Student Innovation Fund of Donghua University,China(No.20D310111)。
文摘Flexible piezoresistive pressure sensors can offer convenient detection of mechanical deformations for wearable electronics.Previous studies of flexible piezoresistive pressure sensors focus on the sensitivity but the low-cost and self-powered sensors remain a challenge due to the deviation of resistance signal acquisition caused by thermoelectric voltage.Here,piezoresistive pressure sensors with ultralow Seebeck coefficient of-0.72μV/K based on carbon nanotubes(CNTs)/polyethyleneimine(PEI)/melamine(CPM)sponge are reported.Due to the diminished Seebeck effect,the CPM sponge pressure sensors successfully reduce the deviation to 18.75%and can keep stable sensitivity and resistance change under a very low working voltage and change temperature environment.The stable properties of the sensors make them successful to work for real-time sensing in self-powered wearable electronics.