Anritsu Corporation（社長 濱田 宏一）宣布，該公司發現奈米級的網狀石墨烯在室溫下，展現出與以往常識不同的熱導率特性。此研究成果由安立知先端技術研究所（以下稱先端研）所發現，並已刊載於國際科學期刊「2D Materials」。
https://doi.org/10.1088/2053-1583/ae525a
智慧型手機、5G設備、個人電腦等裝置在小型化、高性能化的同時，也面臨內部容易積熱的課題。因此，散熱技術對於未來電子設備的進化不可或缺。石墨烯因其能有效散熱，且具備極薄、輕巧、易彎曲的特性，而備受關注，被視為理想的散熱材料。
此次的發現，不僅證實了石墨烯在散熱方面的潛力，更確認了其在熱管理（控制散熱方向）方面的應用前景。這些特性預期將可應用於次世代電子、能源、通訊、醫療等各個領域的發展。
什麼是石墨烯？
石墨烯是由碳原子以蜂巢狀結構結合而成的薄膜。鉛筆芯所使用的石墨，即是石墨烯層層堆疊而成。由於其厚度僅有一個原子，因此極致輕薄，同時兼具極高的強度與柔軟性。
此外，由於其結晶性高，眾所周知其導熱性極佳。例如，金屬中以銀的熱導率最佳，但石墨烯的熱導率約為銀的10倍。
網狀石墨烯的機制
本研究中，我們嘗試在石墨烯上以奈米級的極小尺度製作規則結構，以期控制其熱導率特性。
通常，結構越精細化，熱導率會越小。實際上，對於帶狀石墨烯，寬度越窄，導熱性越差。
然而，我們發現網狀石墨烯的熱導率，反而會隨著結構的精細化而增大。這被認為是網狀結構的精細化，使得熱流如同波浪般重疊並相互增強所致。此類現象過去僅能在接近絕對零度（-273℃）的極低溫下觀察到，而此次能在室溫下確認，是一項重大的研究成果。
同時，透過調整石墨烯的寬度，可以改變其熱導率，因此，透過在石墨烯元件中改變不同部位的結構，便有可能控制熱流的方向。
透過應用此項技術，預期能夠設計出基於全新機制的新型熱流控制系統。
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常見問題
What is graphene?
Graphene is a sheet material composed of carbon atoms arranged in a honeycomb lattice. It is extremely thin, lightweight, strong, flexible, and an excellent conductor of heat, with a thermal conductivity about 10 times higher than silver.
What is the significance of Anritsu's discovery regarding graphene's thermal conductivity?
Anritsu discovered that nanoscale reticulated graphene exhibits unique thermal conductivity characteristics at room temperature, where finer structures lead to increased thermal conductivity. This phenomenon was previously only observed at extremely low temperatures and opens up new possibilities for thermal management.
What are the potential applications of this discovery?
The discovery has potential applications in next-generation electronics, energy, communications, and medical fields, particularly in advanced heat dissipation and thermal management technologies, enabling smaller, more powerful, and more efficient devices.
How does the reticulated structure of graphene affect its thermal conductivity?
Unlike conventional materials where finer structures reduce thermal conductivity, a reticulated (net-like) structure at the nanoscale causes heat flow to overlap and reinforce, leading to an increase in thermal conductivity at room temperature. Adjusting the width of the graphene can also control this property.
Where can I find the research paper?
The research results have been published in the international scientific journal "2D Materials" and can be accessed at: https://doi.org/10.1088/2053-1583/ae525a
