crystal surfaces. In addition,
the oscillating frequency of a piezoelectrc crystal
decreases on adsorption of a foreign substance
onto its surface.
The variation of oscillating frequency is
proportional to the mass of foreign
molecules deposited on the crystal surface
and the basic frequency of the
piezoelectric crystal.
QuartzCrystalMicrobalance= A poly film-coated piezoele
The crystal structure is a member of the hexagonal crystal system and consists of tetrahedrally coordinated Zinc and Sulfur atoms that are stacked in an ABABAB pattern.
The structure is closely related to the structure of lonsdaleite, or hexagonal diamond.
As there all orientations of the crystal, rings of different 2θ values are formed
A single crystal specimen in a Bragg-Brentano diffrac
1.실험 목적
외팔보의 스프링 상수와 탄성계수를 측정한다. 그리고 변위와 전압사이의 관계식을 만들고 그 의미를 이해한다. Energy harvesting의 모델링을 직접하여 보면서 실제 모델과 실험값의 결과를 분석하고 그 의미를 생각하여 본다.
2.실험 이론
(1) Energy harvesting
Energy harvesting (Power harvesting, Energy
microbalance and extremely high sensitivities can be obtained (in the attogram regime), overcoming other similar and well-known mass detectors, such as the quartzcrystalmicrobalance (QCM).[5] In first approximation cantilevers behave like a harmonic oscillator, and the mass change on a rectangular cantilever will produce a reduction on the resonance frequency, which can be estimated from:
w
감지할 수 있도록 한 장치로, 생체감지물질로는 특정 물질과 선택적으로 반응 및 결합할 수 있는 효소, 항체, 항원, 렉틴, hormonereceptor 등 이 쓰인다. 신호변환방법으로는 전기화학(electrochemical), 형광, 발색, SPR (surface plasmon resonance), FET (field- effect transistor),QCM (quartzcrystalmicrobalance),열센서 등 다양한