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標題: | 石墨烯共振器之製作與量測 Fabrication and Measurements of Graphene Resonators |
作者: | I-Fan Hu 胡逸凡 |
指導教授: | 謝雅萍(Ya-Ping Hsieh),梁啟德(Chi-Te Liang) |
關鍵字: | 石墨烯,二維材料,共振器,微機電元件,高頻量測, Graphene,2-dimensional material,Resonator,Micro-electromechanical device,High-frequency measurement, |
出版年 : | 2019 |
學位: | 碩士 |
摘要: | 由碳原子以六方形式排列組成的二維材料石墨烯因其優異的力學與電學性質而備受矚目。由於石墨烯的諸多優異的性質,如與其簡易結構不相稱極大的楊氏模量、極高的導電與導熱能力、以及其可控的導電度使其極其適合用於製作微機電元件。日前已有學者利用石墨烯製作各式微機電元件如微米級開關、變容二極管和與微米級射頻開關,充分顯示石墨烯作為微機電元件的可靠性。第一個石墨烯共振器於2007年研製。在這項工作之後,已經投入了大量精力來研究和改善石墨烯共振器的性能。
石墨烯共振器是由懸浮石墨烯所構成的微機電元件,會對特定頻率的能量有特殊的回饋反映。當所施加的外力其頻率對應到石墨烯的共振頻率時石墨烯將產生共振現象。由於石墨烯具有極大的有效彈簧常數和極高的表面與體積比,石墨烯共振器的共振頻率可達到射頻的範圍。此外,由於石墨烯的單原子層結構,我們可以通過調節其應變(例如施加外加靜電場)來改變其共振頻率。 經研究顯示,石墨烯共振器的品質常數隨著共振器的尺度所小而下降,反映出在高頻下操作共振器的困難性。在這份研究中,我們設計了一套的自組裝程序,用於製造高共振頻率的共諧振器而不降低品質因數。我們可以通過電信量測方式讀取共振器的共振現象,並通過在其上施加靜電場來調控其共振頻率。於實驗中觀察到的大動態調製範圍充分顯示出我們的共振器非常適合應用於傳感領域。 Graphene, which is a single layer of carbon atoms bonded in a hexagonal lattice, is well known for its good electrical and mechanical properties. Lots of special properties such as large Young’s modulus, high thermal conductance, and gate tunable carrier concentration make it an ideal material for building MEMS device. Electromechanical switch, varactor, and radio frequency switch have been reported in the literature. In addition, the first graphene resonator was built in 2007. After this work, lots of effort has been devoted to studying and improving the performance of the graphene resonator. Graphene resonator, a suspended graphene device with a defined size, will resonate when an external force with a certain frequency is applied. Due to the large effective spring constant and high surface to volume ratio, a graphene resonator can have a resonance frequency in the radio frequency region. Also, one atomic thick structure allows its resonant frequency to be easily changed by tuning its strain such as applying an external static electric field Previous research reported that the quality factor of the graphene resonator will decrease with the scale of resonator implies that it is hard to operate resonator at high frequencies. Here we report a designed self-assembled procedure to fabricate high resonant frequency resonator without degrading the quality factor. We can read out the resonance behavior by electrical measurement scheme and tuning its resonance frequency by applying a static electric field on it. The observed large dynamic range of modulation makes our structures ideally suited for sensing applications. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/21424 |
DOI: | 10.6342/NTU201902266 |
全文授權: | 未授權 |
顯示於系所單位: | 物理學系 |
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