「用胺基酸磨出石墨烯」：低碳、高導電的新製程突破等待量產

石墨烯以「全球最強材料之一」之名聞名超過十年，憑藉超薄、超強、導電佳的特性，被視為電子、能源、先進材料領域的關鍵突破口。然而，要真正進入量產與應用端，它仍跨不過一個核心瓶頸：難以均勻分散。

For more than a decade, graphene has been celebrated for its extreme strength, atomic thinness, and exceptional electrical performance. Yet, despite thousands of studies, it has struggled to transition from the laboratory to scalable commercial use. The main barrier has been its poor dispersibility: graphene sheets tend to clump, making them difficult to integrate into inks, coatings, polymers, or composites without damaging their electronic properties.

過去業界為了改善石墨烯分散性，多半靠氧化、化學改質或極端製程，但這些方式往往破壞石墨烯的導電網絡，使性能大幅下降。墨爾本蒙納許大學研究團隊最新發表的研究則顛覆了這項「兩難」，展示了一種不靠劇烈化學、也不需高溫高壓的全新方法，能同時達到高導電性與高度可分散性，並兼具低能耗與低汙染。

A new study from Monash University challenges this long-standing trade-off. The researchers developed a scalable method that simultaneously enables high electrical conductivity, long-term dispersibility, and dramatically lower environmental impact - without toxic chemicals or extreme processing conditions.

低溫、低能耗、一鍋到底：靠機械力與「甘胺酸」達成氮摻雜

研究團隊採用的是機械化學（mechanochemistry），利用行星式球磨機讓硬球反覆撞擊石墨，使其剝離為薄片，同時讓氮原子嵌入石墨烯的晶格中。但最關鍵的創新，是使用天然胺基酸「甘胺酸」（glycine）作為氮源，而非有毒溶劑或高風險化學品。

A single-step, room-temperature process powered by mechanochemistry

The team used mechanochemistry, driving chemical reactions through mechanical impact rather than heat or solvents. In a planetary ball mill operating at 400 rpm for 20 hours, graphite flakes, potassium hydroxide, and glycine - a naturally occurring amino acid - underwent exfoliation and nitrogen doping in a single step.

在僅 400 rpm、室溫與常壓的條件下進行 20 小時球磨，石墨、氫氧化鉀與甘胺酸便在同一反應器內完成「剝離」、「活化」與「氮摻雜」三件事。

研究結果顯示：

研究也進一步證實，性能提升主要來自「氮功能化」而非氧基團。當研究人員移除氧元素後，石墨烯分散性未受影響，而導電性更提升至 1478 S/m 。

環境負擔大幅降低：E factor 僅 88，遠勝濕式球磨

The process achieved:

Follow-up experiments confirmed that nitrogen functionalization - not oxygen - was responsible for the material’s excellent dispersibility and conductivity. After oxygen groups were removed, dispersibility remained unchanged while conductivity increased to 1478 S/m.

A substantially lower environmental footprint

The researchers evaluated the environmental performance of the method:

These results indicate the method is well-aligned with sustainable manufacturing goals.

團隊量化了製程的環境績效：

這顯示該方法非常適合做為永續材料製程的一環。

實際應用：讓可回收塑料「自我修復」與快速導熱

為驗證其實用性，研究團隊將氮摻雜石墨烯加入可重塑的聚合物「vitrimer」中。僅需不到 1 wt%，便能顯著提升材料性能：

該材料在 176 μm 的刮痕下，可於 6 分鐘內完全修復 ；未填充的 vitrimer 則完全無法進行自癒。 此外，氮摻雜石墨烯使材料的應力鬆弛時間縮短至 16 秒（200°C），明顯優於一般石墨填料的 400 秒。

Real-world validation: stronger, recyclable polymers that self-heal

To test practical performance, the team incorporated small amounts of the nitrogen-doped graphene into a vitrimer - a recyclable polymer capable of bond exchange under heat.

With less than 1 wt% loading, the composite showed:

Scratches up to 176 μm healed within six minutes, a capability entirely absent in the unmodified polymer. Stress relaxation time fell from ~400 seconds (with conventional graphite) to 16 seconds, indicating strong interactions between nitrogen groups and the polymer matrix.

產業意義：提供電動車、綠能、循環材料「下一代導電填料」

石墨烯若能兼具高導電、高分散與低碳製程，潛在應用範圍包含：

Industry implications: A viable pathway to sustainable conductive fillers

If scaled, the method could reshape multiple sectors requiring conductive, lightweight, and sustainable materials:

由於製程符合低能耗、高產率、低毒性的永續要求，研究可望改善石墨烯「能做、做得出、卻不容易量產」的困境。

While industrial-scale milling times will require optimization, the study establishes a credible, lower-carbon route to high-performance graphene, reducing the historical dependence on toxic dopants and high-energy processing.

雖然工業化仍需調整球磨時間與設備規模，但此研究提供一條接近量產、具永續性的材料創新路線，並有可能成為未來高性能導電填料的主流選項。

This research offers a realistic blueprint for next-generation conductive fillers - high-performance, environmentally responsible, and compatible with circular manufacturing.