Very recently, a new sintering technique was developed by Randall, called the “Cold Sintering Process (CSP)”, by which high-dense ceramics can be achieved at extraordinarily low temperature (300℃)[11]. By using this technique, a numerous number of materials were prepared successfully, including ceramics, ceramic/ceramic composites, ceramic/2D nano- material composites, and ceramic/polymer composites, etc[12-16]. Take ZnO for example, after processing at temperature lower than 300℃ using CSP, high-dense ceramics with high relative density 95% were obtained, comparable to those prepared by conventional thermal sintering method[14]. Of particular significance is that the as-cold-sintered ZnO ceramics exhibited small gain size (2 μm), much smaller than those prepared by conventional thermal sintering method. However, the electrical conductivity was very low with values in the range of 10-4-10-6 S/cm after cold-sintering at temperatures from 126℃ to 250℃[14, 17]. Even though, the cold-sintering temperature increased to 305℃, the obtained electrical conductivity was still around 9.0 S/cm. Therefore, the electrical conductivity of the cold-sintered ZnO ceramics remains to be improved.