Dear Ladies and Gentlemen: 
    Welcome you to the Third International Conference on Nanoenergy and Nanosystems 2017 (NENS2017), which will be held on October 21-23, 2017 in Beijing International Convention Center, Beijing, China. 
       In recently years, a fast development of mobile electronics and sensor networks desperately need the supplies of power sources that will meet the independent, sustainable, maintain-free and continuous operations of small electronics. This trend of self-powering technologies is widely driven by applications of nanosensors in medical, environmental, infrastructure monitoring, internet of things and defenses. Nanoenergy is about the applications of nanomaterials and nanotechnology for harvesting energy from our living environment for powering micro/nano-systems. Nanomaterials will also have a broad impact to the large-scale energy, including energy harvesting, power management and energy storage. By integrating mobile power sources with a sensor network, a revolutionary technology is being incubated that will link the objects worldwide in the next 10 years. The objective of NENS2017 will focus on but not limited to following topics: 
      Symposium 1: Nanogenerators and energy harvesting
      Symposium 2: Self-powered sensors and systems
      Symposium 3: Piezotronics and piezo-phototronics
      Symposium 4: Energy storage and self-charging power systems
      Symposium 5: Solar cells and hybridized energy cells
      Symposium 6: Photocatalysis and water splitting
   This conference will provide a platform for scientists in the related fields for exchange scientific information, building relationships, and possibly establishing collaborations. The conference is proposed biannually starting in 2014 and we hope to establish a brand name of its kind for the development of nanoenergy and nanosystems. As the chairman of NENS 2017, I will be pleased to welcome your participations from broad communities, and we will be happy to receive abstracts related to nanoenergy and nanosystems. We will do our best to make this an exciting and unforgettable experience for all the participants. I will look forward to meeting you. 
       Thank you very much. 
       
       Zhong Lin Wang 
       Chairman, Nanoenergy and Nanosystems 2017