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Electrical characterization of an individual nanowire using flexible nanoprobes fabricated by atomic force microscopy-based manipulation
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作者 Yilin Wang Enxiu Wu +3 位作者 Jirui Liu mengke jia Rui Zhang Sen Wu 《Nanotechnology and Precision Engineering》 EI CAS CSCD 2023年第4期55-65,共11页
Nanowires have emerged as promising one-dimensional materials with which to construct various nanocircuits and nanosensors.However,measuring the electrical properties of individual nanowires directly remains challengi... Nanowires have emerged as promising one-dimensional materials with which to construct various nanocircuits and nanosensors.However,measuring the electrical properties of individual nanowires directly remains challenging because of their small size,thereby hindering the comprehensive understanding of nanowire-based device performance.A crucial factor in achieving reliable electrical characterization is establishing well-determined contact conditions between the nanowire sample and the electrodes,which becomes particularly difficult for soft nanowires.Introduced here is a novel technique for measuring the conductivity of an individual nanowire with the aid of automated nanomanipulation using an atomic force microscope.In this method,two nanowire segments cut from the same silver nanowire are positioned onto a pair of gold electrodes,serving as flexible nanoprobes to establish controllable contact with the sample.By changing the contact points along the nanowire sample,conductivity measurements can be performed on different regions,thereby eliminating the influence of contact resistance by analyzing multiple current–voltage curves.Using this approach,the resistivity of a 100-nm-diameter silver nanowire is determined to be 3.49×10^(−8)Ωm. 展开更多
关键词 Electrical characterization NANOWIRE Flexible nanoprobe NANOMANIPULATION AFM
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桂西南喀斯特季节性雨林叶凋落量的时空动态 被引量:5
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作者 贾梦可 郭屹立 +9 位作者 李冬兴 王斌 向悟生 王爱龙 刘晟源 丁涛 黄甫昭 文淑均 陆树华 李先琨 《生物多样性》 CAS CSCD 北大核心 2020年第4期455-462,共8页
森林凋落物是森林生态系统极其重要的组成部分,关系着森林生态系统的物质循环和养分平衡。然而,有关异质性自然森林生态系统中生物与非生物因子对凋落物凋落量的影响机制还存在较大争议。本文以广西弄岗15ha森林动态监测样地中设置的90... 森林凋落物是森林生态系统极其重要的组成部分,关系着森林生态系统的物质循环和养分平衡。然而,有关异质性自然森林生态系统中生物与非生物因子对凋落物凋落量的影响机制还存在较大争议。本文以广西弄岗15ha森林动态监测样地中设置的90个凋落物收集器所收集的凋落叶为研究对象,选取2013-2018年连续6年的凋落叶数据探讨了森林叶凋落量的时空动态,旨在深入了解该地区森林生态系统的物质循环过程及凋落量的影响因子。结果显示:2013-2018年的年均叶凋落量为4,099.44 kg/ha,标准误为232.34,变异系数为0.15,这表明不同年际间叶凋落量存在明显差异;不同年际间叶凋落量的节律性变化为双峰型、三峰型或多峰型,说明不同年份的叶凋落量存在明显的节律性差异,但总体而言高峰期主要出现在每年的春季(3-4月)和秋季(8-10月);生态因子对叶凋落量年际动态存在显著影响,其累计解释率为69.3%,其中海拔对叶凋落量的影响最强,解释率为46.5%;而生物因子如胸径变异系数、单位面积胸高断面积之和和物种丰富度则对叶凋落量的影响较弱。多年的连续监测表明,喀斯特季节性雨林不同年际间叶片的凋落量和节律性存在显著差异,而非生物因子,如海拔是形成叶凋落量空间变异的主要因素。 展开更多
关键词 喀斯特季节性雨林 叶凋落量 年际差异 节律性 生态因子
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