1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi’an 710072, China
2. Center for Wall Painting Protection, Shaanxi History Museum, Xi’an 710061, China
3. Department of Chemistry, University of Florence, Via della Lastruccia 3-13, 50019 Sesto Fiorentino, FI, Italy
4. CNR-Institute of Geosciences and Earth Resources, Via Giorgio La Pira 4, 50121 Florence, Italy
5. Department of Mechanical Engineering, University of Delaware, Newark, Delaware 19716, United States