本實驗主要為使用過渡金屬硫化物之二硒化鉬 (MoSe2)應用於生物電化學的檢測當中，以 p-type 矽基板為基底，為了增加 MoSe2 比表面積與感測靈敏度，利用熱化學氣相沉積法將 MoSe2 披覆於自訂圖形之奈米碳管陣列之上，將此三維材料當做電雙層電容器之電極材料，量測其電化學數值以此分析材料特性，奈米碳管之結構對於生物性感測常造成靈敏度不足而需要化學處理，然而 MoSe2 與奈米碳管陣列之結合，因為其晶格常數接近而能得到穩定的結合，因此不需要特別處理奈米碳管之化性，此三維材料之電化學電容值為 147.6 F/g；接著將膽固醇氧化酶物理性披覆於此電極材料之上，製成膽固醇生物感測器，使用循環伏安法來檢測膽固醇之濃度，因為此膽固醇生物酶檢測法為將膽固醇催化為 H2O2，因此本實驗也會進行 H2O2的濃度檢測，不論是檢測 H2O2 還是膽固醇，隨著掃描速率的增加，我們發現氧化還原峰電流值以線性方式增強，這明確顯示電活性的膽固醇物質以化學吸附的方式在此電極上產生反應電流，且膽固醇氧化酶確實的對膽固醇進行催化分解，本實驗針對 10 μM 到 10 mM 的 H2O2 和膽固醇進行分段檢測 (人體膽固醇濃度為 3.36 mM 到 5.17 mM)，得到了優異的靈敏度、低的檢測極限與高的準確値，最優異的靈敏度分別為 H2O2 在 0 μM 到 100 μM 濃度下有 860 μA/mM 的靈敏度和 10 μM 的檢測極限，膽固醇在 0 μM 到 100 μM 濃度下有本實驗最高之 5.09 μA/μM 的靈敏度，因此所有數據顯示ChOx/MoSe2/CNTs 為一優異的膽固醇感測器。

Transition metal dichalcogenides, MoSe2 were used in cholesterol biosensor
electrochemical analysis. In this experiment, we chose p-type silicon as the basis,
and the MoSe2 were combined with carbon nanotubes (Carbon nanotubes, CNTs)
on it by thermal chemical vapor deposition (TCVD) to enhance the contact area
and improve the detection sensitivity. we would use it as the electrode in the
following electrochemistry measurement.The CNTs structural stability resulted in
insufficiient sensitivity for biological analysis, but the combination of CNTs and
MoSe2 can achieve the cholesterol detection without extra chemical treatment
because their similar lattice constants obtain structural stability. We noticed that
MoSe2/CNTs get the best capacitance value of 147 F/g. After that, the cholesterol
oxidase were physical covering on MoSe2/CNTs , and it were used to detect
cholesterol concentration by cyclic voltammetry. This experiment also detected
H2O2 on account of the way biological enzyme detection was catalyze cholesterol
to form H2O2.No matter cholesterol or H2O2, the current densities of the reduction
current linearly increase with the scan rate, meaning that the cholesterol
electroactive molecules are an adsorption-controlled process on MoSe2/CNTs and
the cholesterol oxidase (ChOx) did catalyze the breakdown of cholesterol.This
work detected cholesterol and H2O2 from 10 μM to 10 mM (a person with the
normal level of cholesterol is in the range from 3.36 mM to 5.17 mM), and we get
greatrst sensitivity 、 low detection limit and excellent accuracy. The best
sensitivity were 860 μA/mM for H2O2 in the range from 0 μM-100 μM and 5.09
μA/μM for cholesterol in the range from 0 μM-100 μM, respectively.
MoSe2/CNTs was a excellent and practical for biosensor, first and last.

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