Direct-Write Piezoelectric Polymeric Nanogenerator with High Energy Conversion Efficiency Chang, Chieh ; Tran, Van H. ; Wang, Junbo ; Fuh, Yiin-Kuen ; Lin, Liwei Abstract Publication: Nano Letters Pub Date: February 2010 DOI: 10.1021/nl9040719 Bibcode: 2010NanoL..10..726C