基金Supported by the National Natural Science Foundation of China under Grant Nos 11104171,11404199,11574187 and 11604188 the Youth Science Foundation of Shanxi Province of China under Grant No 2012021003-1 the Natural Science Foundation for Youths of Shanxi Province under Grant Nos 201601D201027 and 1331KSC
基金We thank Prof. Qingfei Liu from School of Pharmaceutical Sciences in Tsinghua University for his kind help in cellulose homogenization. We thank Yuchen Lin for his help in AFM analysis. Y. F. thanks to the support from the National Natural Science Foundation of China （Nos. 21673057 and 31600868） and Beijing Science and Technology Program （No. Z161100002116010）. H. B. L. thanks to the support from BOE Technology Group Co., Ltd. under the project of nanopaper-based multifunctional flexible sensors and the National Key R＆D Program of China （No. 2017YFF0209901）.
基金This study was co-supported by the National Natural Science Foundation-Outstanding Youth Foundation of China （No. 51622501）, the National Natural Science Foundation of China （Nos. 51375075 and 51227004）, the Fundamental Research Funds for the Central Universities of China, and the Science Fund for Creative Research Groups of China （No. 51321004）.
基金primarily funded by the High Impact Research Grant from the Malaysian Ministry of Higher Education（UM.C/625/1/HIR/MOHE/ENG/12,H16001-D000012） a secondarily by a University of Malaya Research Grant（RG155-12AET）