本論文針對 SrTiO3/graphene 複合材料分別以不同體積百分比(3%、4%、5%、7%、10%、12%)系列樣品，以XRD、XPS及FE-SEM進行顯微結構與成分分析，並於10至300 K溫度區間進行電阻率(ρ)、熱導率(κ)及熱電勢(S)之熱電物理性質之研究。
成分分析以及顯微結構分析中，XRD結果顯示石墨烯添加比例越多，於(002)位置的石墨烯訊號強度逐漸增加，而XPS量測結果比對database得知Sr價數為2+、Ti價數為4+ ，且C1s能譜圖於284.5 eV之束縛能對應到C-C單鍵，且確定此為sp^2鍵結軌域。FE-SEM形貌顯示出石墨烯以片狀微米尺度分佈於奈米尺度顆粒之SrTiO3塊材中。
熱電量測結果顯示，所有樣品皆呈半導體行為，且隨石墨烯添加比例上升其電阻率越小。Seebeck係數量測中發現在低溫段有n轉p-type的現象，而高溫段樣品主要載子皆為電洞，其中以SrTiO3+10 vol.% graphene室溫下Seebeck值為22 μV/K為最佳。熱傳導率部分，其熱傳導率在室溫時數值從0.7變化至3 (W/m K) ，且隨石墨烯比例添加越多熱導率越高，推測是由添加石墨烯的高熱導所致。

In this thesis, composites of SrTiO3/graphene with various volume fractions of 3%, 4%, 5%, 7%, 10% and 12% were prepared. The composition and microstructure of these composites were examined by X-ray diffractometer (XRD), X-ray photoelectron spectrometer (XPS) and scanning electron microscope (FE-SEM). Besides, thermoelectric properties including electrical resistivity (), Seebeck coefficient (S), and thermal conductivity () were performed in the temperature range between 10 K and 300 K on these composites.
The XRD patterns of SrTiO3/graphene composites showed that the intensity of the dominant (002) diffraction peak of graphene increases with increasing graphene content. The XPS measurements revealed that the peak features of C1s showed C-C single bond and sp2 characteristics with the binding energy located at 284.5 eV. The microstructures of 5% SrTiO3/graphene composite clearly demonstrated that SrTiO3 particles aggregated with a size of few tenths nanometer and the transparent graphene micro-sheets randomly distributed in the SrTiO3 aggregations.
The electrical resistivity of the studied samples decreases with increasing temperature indicating the semiconducting nature of these composites. Besides, a substantial decrease in  was noticed with increasing graphene content. The Seebeck coefficient of all SrTiO3/graphene composites is positive at room temperature, suggesting that the p-type carriers dominate the thermoelectric transport. The thermal conductivity of these composites increases substantially with increasing graphene content, presumably due to the high thermal conductivity of graphene.

摘要 I
Abstract III
圖目錄 VII
第一章 緒論 1
1-1 研究背景 1
1-2 研究動機 2
1-3 研究方向 2
第二章 基礎理論 3
2-1 材料基本特性 3
2-1-1 SrTiO3基本特性 3
2-1-2 Graphene基本特性 4
2-2 電阻率 5
2-3 熱電現象 6
2-3-1 Seebeck效應 6
2-3-2 Seebeck係數 8
2-4 熱傳導率 11
2-4-1 熱傳導係數 11
2-4-2聲子對熱傳導的影響 12
2-4-3電子對熱傳導的影響 15
第三章 實驗方法 17
3-1 實驗樣品製備 17
3-2 顯微結構與成分分析 18
3-2-1 X-Ray (X-ray diffractometer) 18
3-2-2 XPS(X-ray Photoelectron Spectrometer) 18
3-2-3場發射型掃描電子顯微鏡(FE-SEM) 18
3-3 量測系統與方法 19
3-3-1 低溫冷卻系統 19
3-3-2 電阻率量測方法 20
3-3-3 熱傳導率的量測 22
3-3-4 Seebeck 係數量測 23
3-4 實驗控制程式 24
第四章 實驗結果與分析 31
4-1 顯微結構與成分分析 31
4-1-1 X-Ray定性分析 31
4-1-2 XPS定性分析 32
4-1-3 FE_SEM顯微結構分析 35
4-3 電阻率量測結果分析 39
4-4 Seebeck係數量測分析 40
4-5 熱傳導率量測分析 42
4-6 熱電優質ZT 42
第五章 結論 45
參考文獻 47

1.熱電材料應用簡介 http://tns.ndhu.edu.tw/~ykkuo/thermoelectric.pdf 。〈檢索日期 2018/07/01〉
2.黃振東、徐振庭 熱電材料 科學發展 2013年6月 486期〈檢索日期 2018/07/01〉
3.Marques, Ana Claúdia Lourenço Santana. "Advanced Si pad detector development and SrTio3 studies by emission channeling and hyperfine interaction experiments." (2009).
4.林志堅 石墨烯與二維材料介紹http://cmnst.ncku.edu.tw/ezfiles/23/1023/img/2601/435955689.pdf。〈檢索日期 2018/07/01〉
5.Baran, Jakub D., et al. "Structural, Electronic, and Transport Properties of Hybrid SrTiO3-Graphene and Carbon Nanoribbon Interfaces." Chemistry of Materials 29.17 (2017): 7364-7370.
6.2017 Thermo Fisher Scientific Inc. https://xpssimplified.com/elements/carbon.php〈檢索日期 2018/07/01〉
7.Lin, Yue, et al. "Thermoelectric power generation from lanthanum strontium titanium oxide at room temperature through the addition of graphene." ACS applied materials & interfaces7.29 (2015): 15898-15908.
8.Ryu, Hyejin, et al. "Temperature-Dependent Electron–Electron Interaction in Graphene on SrTiO3." Nano letters 17.10 (2017): 5914-5918.
9.Feng, Xiaopeng, et al. "Graphene promoted oxygen vacancies in perovskite for enhanced thermoelectric properties." Carbon 112 (2017): 169-176.
10.Feng, Bin, et al. "Enhanced thermoelectric properties of p-type CoSb 3/graphene nanocomposite." Journal of Materials Chemistry A 1.42 (2013): 13111-13119.
11.Zhao, Degang, Xuezhen Wang, and Di Wu. "Enhanced Thermoelectric Properties of Graphene/Cu2SnSe3 Composites." Crystals 7.3 (2017): 71.
12.Sun, Jifeng, and David J. Singh. "Thermoelectric properties of n-type SrTiO3." APL Materials 4.10 (2016): 104803.
13.Couto, Nuno JG, Benjamin Sacépé, and Alberto F. Morpurgo. "Transport through graphene on SrTiO 3." Physical review letters107.22 (2011): 225501.
14. Bach, P. L., et al. "Tuning the thermoelectric properties of SrTiO3 by controlled oxygen doping." arXiv preprint arXiv:1211.1615(2012).
15.Wang, Jun, et al. "High thermoelectric performance of niobium-doped strontium titanate bulk material affected by all-scale grain boundary and inclusions." Scripta Materialia 99 (2015): 25-28.
16.Wang, Hongchao, et al. "Recent development of n-type perovskite thermoelectrics." Journal of Materiomics 2.3 (2016): 225-236.
17.Muley, Sarang V., and N. M. Ravindra. "Thermoelectric properties of pristine and doped graphene nanosheets and graphene nanoribbons: Part I." JOM 68.6 (2016): 1653-1659.
18.Muley, Sarang V., and N. M. Ravindra. "Thermoelectric properties of pristine and doped graphene nanosheets and graphene nanoribbons: Part II." JOM 68.6 (2016): 1660-1666.