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The emerging field of printed electronics requires a series of functional materials for various applications. Much efforts have been invested in the field of printable inks for conductive materials. Among the precious metals, silver is the most commonly used printed conductor because of its high conductivity and oxidation resistance. In addition, copper inks and conductive polymers (such as PEDOT:PSS) have been introduced for printed electronics applications. These materials all provide moderate conductivity at low cost, but have limitations in terms of chemical and thermal stability. Graphene has high charge carrier mobility, excellent thermal, chemical stability and inherent flexibility, which has been proven to be used in many applications in printed electronics, including chemical and thermal sensors, miniature supercapacitors and thin film transistors.