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首页> 外文期刊>Advanced Functional Materials >Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms
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Porous Silicon Nanostructures as Effective Faradaic Electrochemical Sensing Platforms

机译：多孔硅纳米结构作为有效的法拉第电化学传感平台

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摘要

The electrochemical performance of porous silicon (pSi) stabilized via thermal decomposition of acetylene gas is investigated for the first time. In this study, pSi undergoes two thermal treatments at either 525 or 800 degrees C, which result in hydrogen-terminated thermally hydrocarbonized pSi (THCpSi) and hydroxyl-terminated thermally carbonized pSi (TCpSi), respectively, the latter upon dipping in hydrofluoric acid to activate the surface termination. Electrochemical characterization, using cyclic voltammetry, chronocoulometry, and electrochemical impedance spectroscopy in the presence of several redox pairs, [Fe(CN)(6)](3/4-), [Ru(NH3)(6)](2/3+), and hydroquinone/quinone, is used to demonstrate the versatility and high stability to degradation of carbon-stabilized pSi nanostructures and their excellent electrochemical performance. Added to the large surface area, adjustable pore morphology and tailorable surface chemistry of THCpSi and TCpSi, these nanostructures demonstrate fast electron-transfer kinetics, providing key advantages over conventional carbon electrodes. The versatile surface chemistry of THCpSi and TCpSi offer various possibilities to introduce multiple functional groups depending on the nature of the bioreceptor to be immobilized. For proof of principle, the use of a THCpSi-based immunosensor to detect MS2 bacteriophage is demonstrated by means of electrochemical impedance spectroscopy, showing a detection limit of 4.9 pfu mL(-1). Carbon-stabilized pSi structures represent a new class of nanostructured electrodes for biosensing applications.
机译：首次研究了通过乙炔气体热分解稳定的多孔硅（pSi）的电化学性能。在这项研究中，pSi在525或800摄氏度下进行了两次热处理，分别导致了氢封端的热烃化pSi（THCpSi）和羟基封端的热碳化pSi（TCpSi），后者在将氢氟酸浸入激活表面终端。电化学表征，使用循环伏安法，计时库仑法和电化学阻抗谱，在几个氧化还原对存在下，[Fe（CN）（6）]（3 / 4-），[Ru（NH3）（6）]（2/3 +）和对苯二酚/醌被用来证明碳稳定的pSi纳米结构降解的多功能性和高稳定性以及出色的电化学性能。这些纳米结构除具有大表面积，可调节的孔形态和可调节的THCpSi和TCpSi表面化学外，还显示出快速的电子转移动力学，与传统的碳电极相比具有关键优势。根据要固定的生物受体的性质，THCpSi和TCpSi的通用表面化学为引入多个官能团提供了多种可能性。为进行原理验证，通过电化学阻抗谱法证明了使用基于THCpSi的免疫传感器检测MS2噬菌体，其检测极限为4.9 pfu mL（-1）。碳稳定的pSi结构代表了用于生物传感应用的新型纳米结构电极。

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  • 来源
    《Advanced Functional Materials》 |2019年第24期|1809206.1-1809206.12|共12页
  • 作者

    Guo Keying; Sharma Apoorva; Toh Rou Jun; de Eulate Eva Alvarez; Gengenbach Thomas R.; Ceto Xavier; Voelcker Nicolas H.; Prieto-Simon Beatriz;

  • 作者单位

    Monash Univ, Monash Inst Pharmaceut Sci, Drug Delivery, Disposit & Dynam, Parkville, Vic 3052, Australia;

    Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia;

    CSIRO, Clayton, Vic 3168, Australia;

    Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia;

    CSIRO, Clayton, Vic 3168, Australia;

    Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia;

    Monash Univ, Monash Inst Pharmaceut Sci, Drug Delivery, Disposit & Dynam, Parkville, Vic 3052, Australia|Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia|CSIRO, Clayton, Vic 3168, Australia|Melbourne Ctr Nanofabricat, Australian Natl Fabricat Facil, Victorian Node, Clayton, Vic 3168, Australia;

    Monash Univ, Monash Inst Pharmaceut Sci, Drug Delivery, Disposit & Dynam, Parkville, Vic 3052, Australia|Univ South Australia, Future Ind Inst, Mawson Lakes, SA 5095, Australia;

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  • 正文语种 eng
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  • 关键词

    biosensing; carbon stabilization; electrochemistry; porous silicon;

    机译：生物传感碳稳定电化学多孔硅;

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