*’Nano’ means….
Nanometer: one billionth of a meter
Nano-: prefix comes from the Greek word for ‘dwarf’
Chemical, physical, and biological properties that differ from those of their larger, or bulk counterparts
Nanotechnology: The National Nanotechnology Initiative(NNI)-> the science of materials and phenomena in the range of 1 to 100nm in diameter
*Features of ‘nanoparticles
additional redox mediators, enzymes, which exibit redox properities and are able to directly exchange electrons with conducting materials, are applied.
Hemoproteins usually are able to exchange electrons directly with electrode.
Electron transfer proteins
ex. Cytochrome-c, oxidoreductase,
ferrocytochrome-c, O2 oxidoreductase …
SEM?
Scanning electronmicroscope
To analysis surface of specimen
Qualitative analysis at certain point
Operation principal of SEM
Emission electron from filament
Accelerate electron by electric field
Focusing electron by lens → mono-chromatic electron beam
Generate secondary electron and etc.
Detection of electron
ElectronMicroscope)
Images are produced by scanning a focused electron beam across the surface of a specimen. In the most common mode, the low energy secondary electrons emitted are detected and used to modulate the brightness of a synchronously scanned CRT. Other signals can also be detected. X-rays, characteristic of that part of the specimen probed by the electron beam, allow both a quali
것을 강조하고 있다(교육부, 1999). .
≪ … 중 략 … ≫
Ⅱ. 현미경의 종류
1. 광학 현미경(light microscope)
일반적으로 가장 널리 사용하는 현미경이다.
2. 암시야 현미경(dark field microscope)
습윤 표본으로 암시야 콘덴서를 이용하여 어두운 시야에서 빛나는 물체를 관찰할 때 사용한다.