本研究利用陽極氧化鋁(Anodic aluminum oxide, AAO) 模板輔助，進行電化學電鍍金奈米柱，應用於有機硫化物之氣體感測，相較於一般平面金薄膜結構，金奈米柱為一維奈米結構，有較大的比表面積 (Specific Surface Area, SSA)，有助於提升氣體感測之靈敏度。
本實驗利用陽極氧化鋁模板輔助成長金奈米柱，探討金奈米柱成長之均勻性與填孔程度。在室溫下進行電鍍，並於電鍍液中添加3.75 M二甲基亞碸調整其濃稠度，酸鹼值調變以pH 1.33為最佳參數，電鍍工作週期設定為10%時，具有最佳填孔均勻性。接著於45℃下，以4 M氫氧化鈉將模板完全蝕刻，裸露出金奈米柱結構，進而應用於甲基硫醇氣體之感測，當氣體濃度為4 ppm時，靈敏度為 -19.84%，與金薄膜 -1.55%相比，有較佳的靈敏度；並將金奈米柱分別感測1 ppm氬氣和1 ppm硫化氫，確認本實驗甲基硫醇感測器之選擇性。

This study presents a simple process for producing resistance-based mercaptan gas sensor utilizing gold nanorod structure via AAO template. One-dimensional gold nanorod was prepared using electrodeposition method under alternating bias. It has been found that Au nanoparticles exhibit high catalytic activity towards H2O2. The electrodeposition parameters of pH, duty cycle and DMSO concentration were investigated. The AAO template was removed successfully with sodium hydroxide at 45℃. The current signal showed a concentration-dependent results, when the gold nanorod was exposed to a small concentration of mercaptan gas. And the sensitivity and selectivity of mercaptan gas sensor were shown. Gold nanorod was also characterized by transmission electron microscopy and the phase structure of Au composition was proved by X-ray diffraction.

[1] Wagner, R. S., and W. C. Ellis, "Vapor‐liquid‐solid mechanism of single crystal growth, " Applied Physics Letters 4.5: 89-90, 1964.
[2] Wang, H., Huff, T. B., Zweifel, D. A., He, W., Low, P. S., Wei, A., & Cheng, J. X., "In vitro and in vivo two-photon luminescence imaging of single gold nanorods," Proceedings of the National Academy of Sciences of the United States of America 102.44: 15752-15756, 2005.
[3] Keller, F., M. S. Hunter, and D. L. Robinson, "Structural features of oxide coatings on aluminum," Journal of the Electrochemical Society 100.9: 411-419, 1953.
[4] Li, Y., Meng, G. W., Zhang, L. D., & Phillipp, F., "Ordered semiconductor ZnO nanowire arrays and their photoluminescence properties," Applied Physics Letters 76.15: 2011-2013, 2000.
[5] Jessensky, O., F. Müller, and U. Gösele, "Self-organized formation of hexagonal pore arrays in anodic alumina," Applied physics letters 72.10: 1173-1175, 1998.
[6] Li, Feiyue, Lan Zhang, and Robert M. Metzger, "On the growth of highly ordered pores in anodized aluminum oxide," Chemistry of materials 10.9: 2470-2480, 1998.
[7] Thompson, G. E., G. C. Wood, and J. C. Scully, "Corrosion: aqueous processes and passive films," Treatise on materials science and technology Scully JC 23: 205-329, 1983.
[8] Ma, Kuixiang, Tai‐Shung Chung, and Robert J. Good, "Surface energy of thermotropic liquid crystalline polyesters and polyesteramide," Journal of Polymer Science Part B Polymer Physics 36.13: 2327-2337, 1998.
[9] KumaráSarma, Tridib, "Synthesis of Au nanoparticle–conductive polyaniline composite using H2O2 as oxidising as well as reducing agent," Chemical Communications 10: 1048-1049, 2002.

[10] Cui, Chun-Hua, Hui-Hui Li, and Shu-Hong Yu, "A general approach to electrochemical deposition of high quality free-standing noble metal (Pd, Pt, Au, Ag) sub-micron tubes composed of nanoparticles in polar aprotic solvent," Chemical Communications 46.6: 940-942, 2010.
[11] Hung, Pin-Kun, Tsung-Hau Lin, and Mau-Phon Houng, "Characteristics of CuInSe2 Nanowire Arrays Electrodeposited into Anodic Alumina Templates with Dimethyl Sulfoxide (DMSO) Additive," Journal of The Electrochemical Society 161.3: D79-D86 , 2014.
[12] Yang, J. S., Lee, C. C., Yau, S. L., Chang, C. C., Lee, C. C., & Leu, J. M., "Conformation and monolayer assembly structure of a pentiptycene-derived α, ω-alkanedithiol," The Journal of Organic Chemistry 65.3: 871-877, 2000.
[13] Nuzzo, Ralph G., and David L. Allara, "Adsorption of bifunctional organic disulfides on gold surfaces," Journal of the American Chemical Society 105.13: 4481-4483, 1983.
[14] Sellers, H., Ulman, A., Shnidman, Y., & Eilers, J. E., "Structure and binding of alkanethiolates on gold and silver surfaces: implications for self-assembled monolayers," Journal of the American Chemical Society 115.21: 9389-9401, 1993.
[15] Vericat, C., Vela, M. E., Benitez, G., Carro, P., & Salvarezza, R. C., "Self-assembled monolayers of thiols and dithiols on gold: new challenges for a well-known system," Chemical Society Reviews 39.5: 1805-1834, 2010.
[16] Atkins, Peter W., and Loretta Jones, "Chemistry Principles: The Quest for Insight,": 285-287, 1999.
[17] 汪建民，“材料分析”，中國材料科學學會， 新竹， 1998年。
[18] Fathy, Naglaa, Ryohei Kobayashi, and Masaya Ichimura, "Preparation of ZnS thin films by the pulsed electrochemical deposition," Materials Science and Engineering: B 107.3: 271-276, 2004.
[19] 許樹恩，吳泰伯，“光繞射原理與材料結構分析”，材料科學叢書，Chap, 20: 532-533，1996年。
[20] 林麗娟，“X 光繞射原理及其應用”，X光材料分析技術與應用專題，1994年。
[21] 陳力俊等著，“材料電子顯微鏡學”，行政院國科會精密儀器發展中心，p.1~20、p.49~50、p.251~285 ，1990年。
[22] Wan, Jun, Junjie Ding, and Meng Wang, "Preparation of gold nanotube by direct electrodeposition for biosensors," Journal of Cluster Science 21.4: 669-677, 2010.
[23] 潘善林等著，“模板合成法製備金鈉米線的研究”，高等學校化學學報， 20.10: 1622-1624，1999年。
[24] Wang, Qingping, Fanfei Min, and Jinbo Zhu, "Preparation of gold nanowires and its application in glucose biosensing," Materials Letters 91: 9-1, 2013.
[25] Wang, Z., Y-K. Su, and H-L. Li, "AFM study of gold nanowire array electrodeposited within anodic aluminum oxide template," Applied Physics A 74.4: 563-565, 2002.
[26] Guduru, S., Singh, V. P., Rajaputra, S., Mishra, S., Mangu, R., & Omer, I. S., "Characteristics of gold/cadmium sulfide nanowire Schottky diodes," Thin Solid Films 518.7: 1809-1814, 2010.
[27] Sadeghian, Ramin Banan, and Mojtaba Kahrizi, "A low pressure gas ionization sensor using freestanding gold nanowires," in Proc. IEEE ISlE, Vigo, Spain, pp. 1387-1390, June 2007.
 
[28] Taşaltın, N., Öztürk, S., Kılınç, N., Yüzer, H., & Öztürk, Z. Z., "Simple fabrication of hexagonally well-ordered AAO template on silicon substrate in two dimensions," Applied Physics A 95.3: 781-787, 2009.
[29] Dou, R., and B. Derby, "The strength of gold nanowire forests," Scripta materialia 59.2: 151-154, 2008.
[30] Xu, Q., Meng, G., Han, F., Zhao, X., Kong, M., & Zhu, X., "Controlled fabrication of gold and polypyrrole nanowires with straight and branched morphologies via porous alumina template-assisted approach," Materials Letters 63.16: 1431-1434, 2009.