• Title/Summary/Keyword: 금 나노입자

Search Result 131, Processing Time 0.039 seconds

Electrochemical Characteristics of Biosensor using Protected Enzyme Nanoparticles for the Detection of Glucose (나노입자 효소를 이용한 포도당 검출용 바이오센서의 전기화학적 특성)

  • Lee, Keum-Ju;Yun, Dong-Hwa;Jang, Jun-Hyoung;Hong, Suk-In
    • Proceedings of the KIEE Conference
    • /
    • 2007.07a
    • /
    • pp.1536-1537
    • /
    • 2007
  • 본 논문은 당뇨병의 지표 물질인 glucose의 농도를 극미량의 시료를 사용하여 정량할 수 있는 방법을 개발하기 위해 organic/inorganic 네트웍에 의해 안정화된 나노입자 효소를 이용하여 초소형 효소 전극을 개발하였다. 전극은 실리콘 웨이퍼상에 반도체 공정을 이용하여 마이크로 크기의 금 박막 전극을 제작하였다, Organic/Inorganic 물질과 함께 합성된 glucose oxidase 나노입자는 20nm 크기로 투과형 전자현미경 (Transmission Electron Microscope:TEM)으로 관찰하고, 푸리에변환 적외선분광법(Fourier transform infrared spectrophotometer : FTIR) 을 이용하여 분석하였고, 전극 특성을 알아보기 위해 Potentiostat/Galvanostat을 사용하여 전기 화학 실험을 하였다. 제작된 전극은 시간대 전류법으로 glucose의 농도에 따른 감도를 측정하였다. 실험결과에 따라 전극의 표면에서 발생하는 전류는 glucose의 농도에 비례함을 알 수 있었다. 또한 순환 전압전류법을 통하여 감도를 측정하였다.

  • PDF

Catalytic Reduction Efficiency Comparison between Porous Au, Pt, and Pd Nanoplates (요철형 금, 백금, 팔라듐 나노플레이트의 촉매성 환원 효율 비교)

  • Shin, Woojun;Kim, Young-Jin;Jang, Hongje;Park, Ji Hun;Kim, Young-Kwan
    • Composites Research
    • /
    • v.32 no.2
    • /
    • pp.85-89
    • /
    • 2019
  • The size, morphology and composition of nanoparticles are regarded as the most important factors to the efficiency of catalytic reduction of various chemical compounds. In order to make a systematic comparison, gold, platinum and palladium nanoplates with 100 nm diameter with rough surface morphology were manufactured through the galvanic replacement reaction, and the reaction kinetics of the catalytic reduction of 4-nitrophenol and 4-nitroaniline was systematically analyzed by spectroscopic measurement. According to the observation, the catalytic reduction efficiency was significantly different against the constitutional elements in order of Pd > Au > Pt, and it was additionally influenced by the type of substrate.

SO2 Adsorption Characteristics of PAN-based Activated Carbon Fiber Impregnated with Palladium and Gold Nanoparticles (팔라듐과 금 나노입자를 첨착한 PAN계 활성탄소섬유의 SO2 흡착특성)

  • Lee, Jin-Jae;Jun, Moon-Gue;Kim, Young-Chai
    • Applied Chemistry for Engineering
    • /
    • v.18 no.5
    • /
    • pp.467-474
    • /
    • 2007
  • The palladium and gold nanoparticles containing PAN-based active carbon fiber (ACF) with a high specific surface area were prepared. Using the BET, TEM, FE-SEM, and XPS, their specific surface area and pore volume, pore structure, and the change in surface oxygen groups with time were analyzed and $SO_2$ adsorption performances were investigated. Because of the impregnating process, the micropore volume was mostly decreased from 95.5% to 30.5~43.7% compared with the total pore volume. And the change in surface oxygen groups with time was higher for the metal salt than the nanoparticles. Also, $SO_2$ breakthrough time of PAN-ACFs impregnated with Au nanoparticles and metal salts did not change compared with that of the non-impregnated PAN-ACF. But the PAN-ACF impregnated with Pd nanoparticles (100 ppm) showed good $SO_2$ adsorption performance as the breakthrough time of 880 sec. These results indicated that the $SO_2$ adsorption performance depended on the change in surface oxygen groups with time and the moderate impregnation of Pd nanoparticles on the PAN-ACF caused the increase in the $SO_2$ adsorption performance by a catalytic action.

Characteristic Analysis of Cyclic Voltammetry on a Self-Assembled Mono-layer Electrode (자가조립 단층 전극에 대한 순환전위법의 특성해석)

  • Cho, Hana;Yoon, Do-Young
    • Journal of the Korean Electrochemical Society
    • /
    • v.16 no.4
    • /
    • pp.217-224
    • /
    • 2013
  • In this paper, we have investigated the characteristics of cyclic voltammetry of a self-assembled mono-layer(SAM) electrode which was modified by 3-Mercaptopropionic acid (3-MPA) on gold nanoparticle(AuNP)-deposited electrode. Also, the transport phenomena of electrons and ions around the electrode have been analyzed. The governing equation and its boundary conditions by adopting the semi-infinite diffusion model were formulated for the mass-transfer dominant system. In order to obtain the numerical solutions of cyclic voltammetry(CV) on SAM electrodes, MATLAB program was implemented by applying the explicit finite difference method. Resulting CV program for the SAM-modified electrode was verified in good agreements with the experimental CV results for the 3-MPA on AuNP electrode.

Preparation of Gold Nanoparticles by Reduction-Oxidation Reaction of HAuCl4 (HAuCl4의 산화-환원 반응에 의한 금 나노 입자)

  • Nguyen, The Dung;Kim, Dong-Joo;Kim, Kyo-Seon
    • Journal of Industrial Technology
    • /
    • v.29 no.B
    • /
    • pp.229-232
    • /
    • 2009
  • We prepared gold nanoparticles (Au NPs) by reduction-oxidation reaction between $HAuCl_4$ and trisodium citrate and measured the size and morphology of Au NPs by TEM for various molar ratios of $HAuCl_4$ to citrate and for various concentrations of $HAuCl_4$. UV-vis spectroscopy was used to characterize the optical properties of Au NPs. Au NPs in the size range from 14.3 nm to 20.3 nm were prepared with monodisperse distribution.

  • PDF