proteins, heavy metals and organic pollutants, as well as the detection of gas, temperature and humidity.In a new paperpublished inLight: Advanced Manufacturing, scientists led by Doctor Zhengfen Wang and Professor Xi Chen from the University of Shanghai for Science and Technology have reviewed laser-scribed graphene (LSG) for sensor fabrication.Graphene has been prepared with various methods, such as mechanical exfoliation,chemical vapor deposition(CVD), epitaxial growth, and chemical reduction of graphene oxide. High-quality graphene can be obtained by mechanical exfoliation, but the low efficiency prevents the large-scale production of graphene.The CVD method is considered the most promising method for preparing large areas andhigh-quality graphene, but the CVD method is constrained by high energy consumption and cost. Graphene films prepared by the epitaxial growth method have good electrical conductivity and high optical transmittance. However, they require high-temperature processing, energy consumption and transfer cost. Chemical reduction of graphene oxide is low in cost and high in efficiency but creates
by TranSpreadLaser-scribed graphene for stress, bio, gas, temperature, and humidity sensors. Credit: TranSpreadWith the development of the information era, sensors capable of transmitting and detecting information have become the leading way to obtain information. Therefore, building a sensor system with a wide detection range, high sensitivity and fast response is essential.Recently,graphenematerials have received increasing attention for sensor applications due to their excellent electrical conductivity and physical, optical, thermal, and structural properties. These applications mainly include the detection of physical properties such as pressure and mechanical strain,chemical substancessuch as glucose, dopamine,
environmental pollution problems during the preparation process. Therefore, graphene's low-cost, high-efficiency, pollution-free preparation methods remain very interesting.The laser direct writing technique has recently attracted research applications in various fields due to its unique advantages of selective and localized reduction, precise and fast patterning, and the absence of masks and additional chemicals. With the laser direct writing technique, a laser is used to irradiate the carbon precursors and generate graphene by in-situ scribing. The whole laser scribing process takes only a few minutes, which significantly improves the efficiency of preparing graphene.The excellent properties of high surface area, high thermal stability, andhigh electrical conductivityexhibited by LSG films have led to its use in a wide variety of applications. Those applications include photodetectors, sensing, energy storage, memristors, holography, antibacterial applications and antennas.The research team discussed the preparation and modification of LSG, which can be prepared by different laser light sources and precursors, including carbon precursors such as GO and
environmental pollution problems during the preparation process. Therefore, graphene's low-cost, high-efficiency, pollution-free preparation methods remain very interesting.The laser direct writing technique has recently attracted research applications in various fields due to its unique advantages of selective and localized reduction, precise and fast patterning, and the absence of masks and additional chemicals. With the laser direct writing technique, a laser is used to irradiate the carbon precursors and generate graphene by in-situ scribing. The whole laser scribing process takes only a few minutes, which significantly improves the efficiency of preparing graphene.The excellent properties of high surface area, high thermal stability, andhigh electrical conductivityexhibited by LSG films have led to its use in a wide variety of applications. Those applications include photodetectors, sensing, energy storage, memristors, holography, antibacterial applications and antennas.The research team discussed the preparation and modification of LSG, which can be prepared by different laser light sources and precursors, including carbon precursors such as GO and
