About the Authors

Laixue Pang

lxpang@sdjtu.edu.cn

Affiliation School of Material Science and Engineering, Shandong Jiaotong University, Jinan, P.R China

Xiaoying Wang

Affiliation School of Material Science and Engineering, Shandong Jiaotong University, Jinan, P.R China

Xinde Tang

Affiliation School of Material Science and Engineering, Shandong Jiaotong University, Jinan, P.R China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: XYW LXP. Performed the experiments: XYW. Analyzed the data: LXP XDT. Contributed reagents/materials/analysis tools: LXP. Wrote the paper: LXP XYW.