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Detection of chemicals in water using a three-dimensional graphene porous structure as liquid-vapor separation filter

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Nano Research 2017年第3期10卷 971-979页

作者： taekyung lim Jaejun Lee Jonghun Lee Sanghyun Ju Department of Physics Kyonggi University Suwon Gyeonggi-Do 443-760 Republic of Korea

In this study, we report the utilization of a three-dimensional （3D） porous graphene structure as liquid-vapor separation filter, which allows the passage of chemical vapors while blocking liquid chemicals and water. The blockage of liquid chemicals and water from semiconducting sensing regions is required to avoid abnormal transistor characteristics. In order to impart omniphobic characteristics, a （heptadecafluoro-1,1,2,2-tetrahydrodecyl）trichlorosilane （HDF-S） self-assembled monolayer was coated on the surface of the 3D porous graphene structure. The concentration of chemical agents in water could be consistently detected by observing the shift in the threshold voltage in the oxide nanowire transistor covered by the HDF-S self-assembled 3D graphene structure. The proposed monitoring method is expected to offer means for application in different environments by providing a stable sensing performance.

关键词： chemical detection graphene structure nanowire transistor self-assembled monolayer omniphobicity

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Development of multi-angle fiber array for accurate measurement of flexion and rotation in human joints

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npj Flexible Electronics 2021年第1期5卷 284-295页

作者： Sang-Mi Jeong Minkyun Son Youngsoo Kang Jonguk Yang taekyung lim Sanghyun Ju Department of Nanoengineering Kyonggi UniversitySuwonGyeonggi-Do 16227South Korea

Herein,we have proposed a method that uses a highly stretchable and conductive fiber-based multi-angle fiber array,which precisely measures human joint motion in various degrees of freedom(flexion and rotation)at the shoulders,knees,and wrists in real *** embedding conductive carbon nanotubes(CNTs)within spandex fibers of high elasticity and shape recovery ratio,we monitored joint motion stably without degrading the fiber’s conductivity even during repeated stretching and contraction of different *** strain occurring in a specific direction was monitored using mapping images generated due to the change in resistance that occurred when 12 CNT-embedded spandex fibers arranged in radial lines at intervals of 15°were stretched or contracted by an external *** proposed high-precision joint-monitoring technology measures human motion accurately and is applicable for use in wearable healthcare devices that require precise measurements.

关键词： fiber rotation angle

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Nucleation and Growth Mechanisms for Pd-Pt Bimetallic Nanodendrites and Their Electrocatalytic Properties

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Nano Research 2010年第2期3卷 69-80页

作者： Byungkwon lim Majiong Jiang taekyung Yu Pedro H.C.Camargo Younan Xia Department of Biomedical Engineering Washington UniversitySt.LouisMissouri 63130USA Department of Chemistry Washington UniversitySt.LouisMissouri 63130USA

In a seed-mediated synthesis, nanocrystal growth is often described by assuming the absence of homogeneous nucleation in the solution. Here we provide new insights into the nucleation and growth mechanisms underlying the formation of bimetallic nanodendrites that are characterized by a dense array of Pt branches anchored to a Pd nanocrystal core. These nanostructures can be easily prepared by a one-step, seeded growth method that involves the reduction of K2PtCl4 by L-ascorbic acid in the presence of 9-nm truncated octahedral Pd seeds in an aqueous solution. Transmission electron microscopy (TEM) and high-resolution TEM analyses revealed that both homogeneous and heterogeneous nucleation of Pt occurred at the very early stages of the synthesis and the Pt branches grew through oriented attachment of small Pt particles that had been formed via homogeneous nucleation. These new findings contradict the generally accepted mechanism for seeded growth that only involves heterogeneous nucleation and simple growth via atomic addition. We have also investigated the electrocatalytic properties of the Pd-Pt nanodendrites for the oxygen reduction and formic acid oxidation reactions by conducting a comparative study with foam-like Pt nanostructures prepared in the absence of Pd seeds under otherwise identical conditions.

关键词： Palladium platinum seeded growth oxygen reduction formic acid oxidation

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