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Network single-walled carbon nanotube biosensors for fast and highly sensitive detection of proteins

机译:网络单壁碳纳米管生物传感器,用于蛋白质的快速和高灵敏度检测

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摘要

Detection of proteins is powerfully assayed in the diagnosis of diseases. A strategy for the development of an ultrahigh sensitivity biosensor based on a network single-walled carbon nanotube (SWNT) field-effect transistor (FET) has been demonstrated. Metallic SWNTs (m-SWNTs) in the network nanotube FET were selectively removed or cut via a carefully controlled procedure of electrical break-down (BD), and left non-conducting m-SWNTs which magnified the Schottky barrier (SB) area. This nanotube FET exhibited ultrahigh sensitivity and fast response to biomolecules. The lowest detection limit of 0.5pM was achieved by exploiting streptavidin (SA) or a biotin/SA pair as the research model, and BD-treated nanotube biosensors had a 2 × 10~4-fold lower minimum detectable concentration than the device without BD treatment. The response time is in the range of 0.3-3min.
机译:蛋白质的检测在疾病诊断中得到了有力的检测。已经证明了开发基于网络单壁碳纳米管(SWNT)场效应晶体管(FET)的超高灵敏度生物传感器的策略。通过小心控制的电击穿(BD)程序,有选择地去除或切割网络纳米管FET中的金属SWNT(m-SWNT),并留下不导电的m-SWNT,这会放大肖特基势垒(SB)区域。这种纳米管FET表现出超高的灵敏度和对生物分子的快速响应。通过使用链霉亲和素(SA)或生物素/ SA对作为研究模型,实现了最低检测限0.5pM,并且BD处理的纳米管生物传感器的最低可检测浓度比没有BD的设备低2×10〜4倍治疗。响应时间在0.3-3分钟范围内。

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