液体中纳米线表面电荷传感器的筛选模型
Screening model for nanowire surface-charge sensors in liquid
摘要：
纳米线场效应晶体管的电导变化被认为是表面电荷的高灵敏探针。然而，由于离子液体和纳米线载流子的竞争性屏蔽，相关生理液体环境的德拜屏蔽对装置性能提出了挑战。我们讨论了这种效应内的N-Fermi和Debye-Huckel理论和圆柱形的电线，可用于估计纳米线表面电荷传感器的灵敏度推导出的分析结果。我们研究了纳米线的半径之间的相互作用，的E-Fermi和德拜屏蔽长度，和功能化分子的长度。将分析结果与现实几何形状的有限元计算进行比较。
英文摘要：
The conductance change of nanowire field-effect transistors is considered a highly sensitive probe for surface charge. However, Debye screening of relevant physiological liquid environments challenge device performance due to competing screening from the ionic liquid and nanowire charge carriers. We discuss this effect within Thomas-Fermi and Debye-Huckel theory and derive analytical results for cylindrical wires which can be used to estimate the sensitivity of nanowire surface-charge sensors. We study the interplay between the nanowire radius, the Thomas-Fermi and Debye screening lengths, and the length of the functionalization molecules. The analytical results are compared to finite-element calculations on a realistic geometry.
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