Thin Films and Nanoscience Laboratory, Department of Physics, Jadavpur University, Kolkata 700032, India.
Nanoscale. 2011 Oct 5;3(10):4135-41. doi: 10.1039/c1nr10383k. Epub 2011 Aug 18.
A three dimensional field emitter comprising hierarchical nanostructures of graphene over flexible fabric substrate is presented. The nanostructuring is realized through plasma treatment of graphene, coaxially deposited over individual carbon fiber by means of simple aqueous phase electrophoretic deposition technique. Hierarchical graphene nanocone, acting as a cold electron emitter, exhibits outstanding electron emission performance with a turn-on field as low as 0.41 V μm(-1) and a threshold field down to 0.81 V μm(-1). Electric field modification around the special woven like geometry of the underlying base fabric substrate serves as the booster to the nanostructured graphene related field amplification at the electron emission site. Superb robustness in the emission stability can be attributed to suppressed joule heating on behalf of higher inborn accessible surface area of graphene nanocone as well as excellent electrical and thermal conductivity of both the graphene and carbon fabrics. Superior flexibility of this high-performance graphene based emitter ensures their potential use in completely foldable and wearable field emission devices.
提出了一种由柔性织物基底上的石墨烯分级纳米结构组成的三维场发射器。通过等离子体处理在单根碳纤维上同轴沉积的石墨烯，实现了纳米结构化，该方法通过简单的水相电泳沉积技术实现。作为冷电子发射器的分层石墨烯纳米锥表现出优异的电子发射性能，开启场低至 0.41 V μm(-1)，阈值场低至 0.81 V μm(-1)。位于下方基底织物的特殊编织状几何形状周围的电场修饰，为电子发射点处的纳米结构石墨烯相关场放大提供了增强作用。由于石墨烯纳米锥具有更高的固有可及表面积，抑制了焦耳加热，同时石墨烯和碳纤维都具有优异的导电性和导热性，因此在发射稳定性方面表现出卓越的稳健性。这种基于高性能石墨烯的发射器具有出色的柔韧性，确保了它们在完全可折叠和可穿戴的场发射器件中的潜在应用。
