氮化銦鎵/氮化鎵多重量子井在光學式氣體及生物分子偵測器之研究

Research on optically detectable gas sensors and biosensors based on InGaN/GaN multiple quantum wells

陳又綺(Yu-Chi Chen)

指導教授 ： 陳永芳

國立臺灣大學/理學院/應用物理所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.00666

摘要

在本篇論文中,我們研究了已修飾的多重量子井此種壓電半導體材料的光學特性,並著重於氣體以及生物分子偵測器上的應用. 其不僅達到優秀的感測能力並且在實用性之元件上俱有潛力.以下分別為上述兩種光學式感測器之摘要:

一,聚乙烯亞胺及澱粉修飾氮化銦鎵/氮化鎵多重量子井之光學式二氧化碳氣體感測器研究:

我們使用了以聚乙烯亞胺及澱粉修飾的氮化銦鎵/氮化鎵多重量子井,由其高度敏感的界面與壓電半導體特性來製作光學式的二氧化碳偵測器.當量子井的表面電荷分佈因為化學作用而變化,內部將感應出內建電場及結構應變,這造成了量子井能階的傾斜進而調變其光學性質.我們透過光激螢光光譜與拉曼散射在不同濃度二氧化碳的分析,證明了此項實驗的可行性與感測器的高感測能力.

二,氧化鋅奈米柱與量子井複合物之酵素催化型光學式生物感測器於乳酸感測之應用:

我們研究了一種非破壞性,高度敏感的光學式生物分子偵測技術,在氧化鋅奈米柱和容易極化的多重量子井半導體覆合並進行生物辨識反應後造成感測表面的電荷分佈變化,量測於乳酸環境下光激螢光光譜與拉曼散射光譜的能譜位移.氧化鋅奈米柱在此實驗不僅提供好的生物相容性與較大的感觸面積,適合酵素固化的環境也提高了乳酸和酵素鍵結與交互作用的能力.實驗顯示我們的乳酸感測器反應時間短且製作簡易卻俱可行性.

關鍵字

多重量子井 ； 量子侷限史塔克效應 ； 光激螢光光譜 ； 拉曼光譜 ； 氣體偵測器 ； 生物分子偵測器

並列摘要

In this thesis, we report the studies on optical properties of functionalized strained semiconductor multiple quantum wells, and focus on the applications of gas sensor and biosensor. They reach excellent sensing ability and provide an opportunity for practical application. The following abstracts describing the highlights of our research are described as follows.

1. An optically detectable CO2 sensor utilizing polyethylenimine and starch functionalized InGaN/GaN multiple quantum wells:

An optically detectable gas sensor based on the high surface sensitivity of functionalized polyethylenimine/starch In0.15Ga0.85N/GaN strained semiconductor multiple quantum wells (MQWs) has been developed. Due to the excellent piezoelectricity of the MQWs, the change of surface charges caused by chemical interaction can introduce a strain and induce an internal field. In turn, it tilts the energy levels of the MQWs and modifies the optical properties. Through the measurements of the changes in photoluminescence as well as Raman scattering spectra under different concentrations of carbon dioxide gas, we demonstrate the feasibility and high sensitivity of the sensors derived from our methodology.

2.Enzyme-based ZnO nanorods grown on InGaN/GaN multiple quantum wells for high performance lactic acid optical biosensor:

A non-destructive and high sensitivity optical biosensor consisted of enzyme-based ZnO nanorods grown on InGaN/GaN multiple quantum wells (MQWs) for lactic acid detection has been demonstrated. Lactic acid concentrations can be detected optically by monitoring the change in photoluminescence and Raman scattering spectra of InGaN/GaN MQWs resulted from the biological recognition process during the interaction between lactic acid and lactate oxidase (LOx). The optical response of the biosensors is generated by the electric field due to the accumulated charges in ZnO nanorods caused the chemical reaction on top of InGaN MQWs. The study shown here reveals that highly sensitive sensors using optical detection based on semiconductor quantum wells with excellent piezoelectricity is feasible for bio-sensing applications.

並列關鍵字

MQWs ； QCSE ； photoluminescence ； gas sensor ； biosensor

參考文獻

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