Abstract:Industrial preparation of graphene has been a research hotspot in recent years. Finding an economical and practical carbon source and reducing the cost of production and instrument is significant in industrial graphene production. Coal is a common carbon source. Efficient improvement and utilization in the cleaning of coal has recently been a popular research area. In this study, we developed a set of graphene preparation methods based on Anhui Huainan’s low-rank gas coal (HNGC). Using self-built experimental … Show more
“…In the Raman image (figure 10 a ), it can be observed that the peaks mainly appear at 1346 cm −1 , 1577 cm −1 and 2691 cm −1 , which are the D-band caused by MLG disorder, G-band and the second-order two-dimensional band of MLG, respectively. Therefore, Raman spectroscopy indicated the MLG existing in the wear scar at 600°C [53,54]. Figure 10( a ) Raman spectra ( b–g ) the XPS spectra of wear scar of Ti6Al4V titanium alloy at 600°C.…”
The solid lubricating coatings have an important role in hot metal forming. However, traditional lubricants cannot be applied to the harsh working conditions. In this investigation, the novel solid lubricant coatings including multi-layer graphene (MLG)/silicon dioxide (SiO
2
) composites and sodium metaphosphate phosphate were prepared. The high-temperature tribological properties of the solid lubricant coatings were investigated by friction and wear tester. The experimental results showed that SiO
2
nanoparticles were evenly grafted by sol–gel method on the surface of MLG, forming MLG/SiO
2
composites. MLG/SiO
2
composites presented excellent thermal stability at 800°C. In the range of 400–800°C, the average coefficients of friction (COFs) were decreased from 0.3936 to 0.3663, and then increased from 0.3663 to 0.4226. Based on the analysis of wear scar, the lubrication mechanisms of the solid lubricating coatings were proposed. The low interlayer shear of MLG and the ball bearing of SiO
2
nanoparticles are the main reason for the reduction of COFs. In addition, the tribo-chemical reaction film formed on the frictional interface could protect the contact surfaces from severe damage. The findings would be beneficial for developing novel lubricants for hot metal forming process.
“…In the Raman image (figure 10 a ), it can be observed that the peaks mainly appear at 1346 cm −1 , 1577 cm −1 and 2691 cm −1 , which are the D-band caused by MLG disorder, G-band and the second-order two-dimensional band of MLG, respectively. Therefore, Raman spectroscopy indicated the MLG existing in the wear scar at 600°C [53,54]. Figure 10( a ) Raman spectra ( b–g ) the XPS spectra of wear scar of Ti6Al4V titanium alloy at 600°C.…”
The solid lubricating coatings have an important role in hot metal forming. However, traditional lubricants cannot be applied to the harsh working conditions. In this investigation, the novel solid lubricant coatings including multi-layer graphene (MLG)/silicon dioxide (SiO
2
) composites and sodium metaphosphate phosphate were prepared. The high-temperature tribological properties of the solid lubricant coatings were investigated by friction and wear tester. The experimental results showed that SiO
2
nanoparticles were evenly grafted by sol–gel method on the surface of MLG, forming MLG/SiO
2
composites. MLG/SiO
2
composites presented excellent thermal stability at 800°C. In the range of 400–800°C, the average coefficients of friction (COFs) were decreased from 0.3936 to 0.3663, and then increased from 0.3663 to 0.4226. Based on the analysis of wear scar, the lubrication mechanisms of the solid lubricating coatings were proposed. The low interlayer shear of MLG and the ball bearing of SiO
2
nanoparticles are the main reason for the reduction of COFs. In addition, the tribo-chemical reaction film formed on the frictional interface could protect the contact surfaces from severe damage. The findings would be beneficial for developing novel lubricants for hot metal forming process.
“…Graphene has recently emerged as a promising sensing material owing to its excellent mechanical and electrical properties. , To commercialize graphene, various synthesis protocols have been developed, including mechanical exfoliation, chemical vapor deposition, and chemical reduction of graphene oxide. − These methods have the advantage in manufacturing graphene of different grades, and they also present challenges, such as nonscalable production, high energy consumption, and massive waste generation . Laser-induced technology has been recognized as a powerful approach for high-throughput, precisely programmable, and mask-free fabrication of various electronics, such as wearable strain sensors, heterostructure transistors, and flexible electrochemical sensors. ,− Laser-induced graphene (LIG) on polyimide (PI) substrates has also been explored for patterned strain sensors, achieving controllable physical and electrical properties and tailorable sensitivities , by precisely controlling laser power, speed, and atmosphere. , Herein, we propose a flexible lip-reading strain sensor based on the LIG.…”
Lip-reading recognition (LRR) has gained significant
attention
due to its potential applications in various scenarios, such as communication
for the speech-impaired, conversations in noisy or dark environments,
and human–machine interactions. However, existing LRR technologies
based on computer vision suffer from drawbacks such as the high cost
of electronic camera equipment and the negative impact of ambient
lighting on recognition accuracy. Herein, a graphene-based flexible
strain sensor is developed through a facile, high-efficiency, and
low-cost laser-induced carbonization technique, which involves the
ablation of polyimide (PI) films using ultraviolet lasers. The sensor’s
patterned stripes and porous structure endow it with sensitivity to
deformations caused by bending and pressing. The well-designed flexible
strain sensor can tightly attach on facial skin and record high-quality
strain signals of various lip muscle movements. When compared to a
preconstructed lip-reading database using a fixed algorithm, the collected
lip-reading signals exhibit a recognition rate exceeding 90%, enabling
seamless human–machine interaction and precise control over
manipulators. Consequently, the LRR approach based on the flexible
strain sensor demonstrates immense potential as a promising platform
for speech-impaired communication and human–machine interactions
in variable environments.
“…However, the Nobel Prize in Chemistry in 2010 was awarded to the UK for the "groundbreaking experiments regarding the two-dimensional material graphene" [4], opening the knowledge to a broad Research staff with particular interest and needs focused on these materials. It is mentioned pure materials such as Graphene [5], Carbon Nanotubes [6], fullerenes [7,8] as well other Carbon-based allotropes [9] based on Carbon that show unique Opto-electronic [10], conductive [11], and Quantum emissions properties [12]. In this regard, these materials are exposed to those with high performances.…”
This review intended to resume key Research reports and publications that open many themes and topics related to Carbon-based semiconductors and Quantum emitters. The Design and synthesis of highly pure materials such as Graphene, Carbon Nanotubes, fullerenes, and other Carbon-based allotropes were shown. They presented their most important and promising properties concerning new studies and developments in photonics. Carbon-based Quantum dots, semiconductors, and higher sized Nanoplatforms allowed us to discuss fundamental studies and perspectives within varied applications. In this context, relevant developments from literature related to electron transfer within various targeted processes, where energy and light transfers occurred through different optical active materials and platforms, were highlighted and discussed. Therefore, many approaches that tuned the desired Optical active properties were shown. Thus, Hybrid materials from single Quantum and Nanoplatforms towards modified substrates were incorporated within varied media such as colloidal dispersions, solid devices, and waveguides. Moreover, Heterojunctions and applications such as energy harvesters and emitter devices were also presented. This manner highlighted varied topics of Photonics' leading current status, perspectives, and implications in Nanophotonics, Quantum photonics, and Optical lenses. Further views and commentaries about Green Photonics were presented as well.
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