High quality Mn-doped (Na,K)NbO3 nanofibers for flexible piezoelectric nanogenerators

Han Byul Kang, Jiyoung Chang, Kisik Koh, Liwei Lin, Yong Soo Cho

Research output: Contribution to journalArticlepeer-review

133 Citations (Scopus)


Enhanced piezoelectric and energy-harvesting characteristics of Mn-doped (Na0.5K0.5)NbO3 (NKN) nanofibers have been investigated with actual fabrication of potential flexible nanogenerators. The electrospinning process of nanofibers has been initially optimized with the proper level of chelating agent and annealing temperature. High quality nanofibers are successfully obtained only by means of a certain level of doped-Mn, which incorporates into the NKN perovskite structure and facilitates significant grain growth. A single-particle-stacked structure along the direction of fiber length becomes more evident with increasing Mn content. An XPS analysis confirms that Mn exists in multivalent states of Mn 2+/Mn3+. The effective piezoelectric coefficient of the nanofibers is found to be enhanced by 5 times with Mn-doping up to 3 mol % as characterized by piezoelectric force microscopy. The resultant flexible nanogenerators on PES films have exhibited ∼0.3 V output voltage and ∼50 nA output current under a bending strain.

Original languageEnglish
Pages (from-to)10576-10582
Number of pages7
JournalACS Applied Materials and Interfaces
Issue number13
Publication statusPublished - 2014 Jul 9

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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