Effect of Substrate Roughness on the Friction and Wear Behaviors of Laser-Induced Graphene Film

Abstract

A rough substrate usually induces severe detriments limiting the performance of anti-friction materials that would lead to an increase in both the friction coefficient and wear rate. In this work, we found that a laser-induced graphene (LIG) film had a good friction adaptability on both mirror-polished and rough Si substrates. The friction coefficient of the LIG increased from 0.11 to 0.24 and the substrate roughness increased from 1.4 nm to 54.8 nm, while the wear life of the LIG was more than 20,000 cycles for both the mirror-polished and rough Si substrates. Optical microscope, Raman spectroscopy and scanning electron microscope analyses revealed a friction mechanism evolution of the LIG films on Si substrates with a different roughness. For the mirror-polished Si substrate, thick and dense graphene nanocrystallite transfer films could form on the counterpart balls, which guaranteed a long and stable wear. For the rough Si substrate, although the asperities on the rough surface would plough the counterpart balls and destabilize the transfer film formation, grooves could effectively store a compressed LIG, benefiting a stable anti-wear performance and reducing the abrasive wear at the friction interface. This work showed that a LIG film had outstanding friction adaptability on Si substrates with a different roughness and that it can be fabricated in a single-step economic process, indicating bright practical prospects in the solid lubrication fields.

Effects of the Transfer Method and Interfacial Adhesion on the Frictional and Wear Resistance Properties of a Graphene-Coated Polymer

“…According to the results, Gr coated on various substrates, including polymers [ 10 , 11 ], aluminum alloys [ 12 ], and steels [ 4 , 13 , 14 ], can effectively improve their frictional and wear resistance properties. In addition, there are several factors affecting the improvement of both properties, such as Gr film thickness [ 15 ], structural defects of Gr [ 9 ], surface chemistry of Gr [ 16 , 17 ], and substrate properties [ 18 ]. Among these, the structural defects and surface chemistry of Gr are dominated by the fabrication process and are considered key factors.…”

Лазерно-Индуцированный Графен И Его Модификация Полипирролом Для Увеличения Емкости Микросуперконденсатора

“…ЛИГ является многофункциональным материалом, и возможности его применения продемонстрированы в устройствах, предназначенных для самых различных целей [20]. ЛИГ можно использовать для уменьшения трения [21], для изготовления микросуперконденсаторов, электрокатализаторов (см. обзор [22]) и различных сенсоров, например, датчиков влажности [11,23] и механического растяжения [24], болометров [25], разнообразных биосенсоров [26,27], а также быстродействующих фотоприемников [28], работающих на эффекте увлечения [29,30].…”

Laser-induced graphene and its modification with polypyrrole for increasing microsupercapacitor capacitance

“…LIG is a multifunctional material whose applications are demonstrated in a wide range of devices [20]. LIG can be used to reduce friction [21], to produce microsupercapacitors, electrocatalysts (see [22]) and various sensors, e.g. humidity sensors [11,23] and strain sensors [24], bolometers [25], various biosensors [26,27] as well as quick-response photodetectors [28] based on photon-drag effect [29,30].…”