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      Influence of graphene coating on altering the heat transfer behavior of microprocessors


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          The continual usage of computers produces excessive heat, which directly affects the processor. The main reason for computer failure is an increase in chip temperature which degrades the performance, reliability and the lifespan of a computer. In order to avoid these limitations, excessive heat should be transferred to the environment. This research article proposes to analyze heat transfer in microprocessors through graphene layer coating. Heat transfer in pure and graphene coated microprocessors, based on 0 %, 50 % and 75 % central processing unit (CPU) usage, has been investigated. Initially, graphene was mixed with ethanol and spin-coated on the surface of microprocessor. Scanning electron microscopy (SEM) analysis confirms the deposition of a graphene layer on the substrate. Applying graphene to the surface of the substrate significantly improves heat transfer due to high thermal conductivity. A maximum of a 5.6 °C difference in heat transfer has been achieved by introducing a graphene layer on the substrate. This experimental analysis proves that graphene is a suitable material for electronic applications.

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          Superior thermal conductivity of single-layer graphene.

          We report the measurement of the thermal conductivity of a suspended single-layer graphene. The room temperature values of the thermal conductivity in the range approximately (4.84+/-0.44)x10(3) to (5.30+/-0.48)x10(3) W/mK were extracted for a single-layer graphene from the dependence of the Raman G peak frequency on the excitation laser power and independently measured G peak temperature coefficient. The extremely high value of the thermal conductivity suggests that graphene can outperform carbon nanotubes in heat conduction. The superb thermal conduction property of graphene is beneficial for the proposed electronic applications and establishes graphene as an excellent material for thermal management.
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            Graphene-multilayer graphene nanocomposites as highly efficient thermal interface materials.

            We found that the optimized mixture of graphene and multilayer graphene, produced by the high-yield inexpensive liquid-phase-exfoliation technique, can lead to an extremely strong enhancement of the cross-plane thermal conductivity K of the composite. The "laser flash" measurements revealed a record-high enhancement of K by 2300% in the graphene-based polymer at the filler loading fraction f = 10 vol %. It was determined that the relatively high concentration of the single-layer and bilayer graphene flakes (~10-15%) present simultaneously with the thicker multilayers of large lateral size (~1 μm) were essential for the observed unusual K enhancement. The thermal conductivity of the commercial thermal grease was increased from an initial value of ~5.8 W/mK to K = 14 W/mK at the small loading f = 2%, which preserved all mechanical properties of the hybrid. Our modeling results suggest that graphene-multilayer graphene nanocomposite used as the thermal interface material outperforms those with carbon nanotubes or metal nanoparticles owing to graphene's aspect ratio and lower Kapitza resistance at the graphene-matrix interface. © 2012 American Chemical Society
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              Thermal properties of graphene and multilayer graphene: Applications in thermal interface materials


                Author and article information

                Materials Testing
                Carl Hanser Verlag
                4 February 2019
                : 61
                : 2
                : 169-172
                1 Erode
                2 Coimbatore
                3 Erode, Tamil Nadu, India
                Author notes
                [* ] Correspondence Address, Prof. Dr. Rathanasamy Rajasekar, Department of Mechanical Engineering, Kongu Engineering College, Perundurai, Erode, Tamil Nadu, India, E-mail: rajasekar.cr@ 123456gmail.com

                Assit. Prof. Thangamuthu Tamilarasi, born 1983, completed her Bachelor of Mechatronics Engineering at Kongu Engineering College, Tamil Nadu, India in 2004. She received her Master's degree in Mechatronics at Kongu Engineering College, Tamil Nadu, India in 2011. Since 2013, she has been working as Assistant Professor in the Department of Mechatronics Engineering at Kongu Engineering College, Erode, Tamilnadu, India.

                Prof. Dr. Rathanasamy Rajasekar, born 1982, received his MSc and PhD degrees in 2008 and 2011 at the Indian Institute of Technology, Kharagpur in the field of Materials Science. He gained Post-Doctoral Research experience in 2011 and 2012 at the Department of Polymer and Nano Engineering at Chonbuk National University, South Korea. Since 2012, he has been working as a Professor in the Department of Mechanical Engineering at Kongu Engineering College, Erode, Tamil Nadu, India.

                Assist. Prof. Dr. Kulandaivel Saminathan, born 1977, received his P.G Degree in the year 2000. He received his PhD degree in 2006, both at Alagappa University, Karaikudi, Tamil Nadu, India. Since 2016, he has been working as an Assistant Professor in the Department of Chemistry at Kongunadu Arts and Science College, Coimbatore, Tamil Nadu, India.

                Palanisamy Gukan, born 1992, finished a Bachelor's in Mechatronics Engineering at K. S. R. College of Technology, Thiruchengode, India. He did his MEng at Kongu Engineering College, Erode, Tamil Nadu, India which he finished in 2015 in the field of Mechatronics. Currently, he is a research scholar in the Department of Mechatronics Engineering at Kongu Engineering College, Erode, Tamil Nadu, India.

                © 2019, Carl Hanser Verlag, München
                Page count
                References: 16, Pages: 4
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science


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