Tuning Oxygen Vacancies of Polycrystalline SnO2 Nano-Fibers for Sensitive Photon and Ultrafast NO(g) Detection
Pei-Rong Li1*, Chun-Yen Lai2, Guan-Hong Wu1, Yi-Ching Ou Yang1, Ping-Hung Yeh1
1Physics, Tamkang University, New Taipei City 25137, Taiwan
2Materials Science and Engineering, National Chiao Tung University, Hsinchu City 30010, Taiwan
* Presenter:Pei-Rong Li, email:ya80799@gmail.com
For defect engineering research, oxygen vacancy structure of polycrystalline SnO2 nano-fibers ( poly- SnO2 NFs ) can be fabricated by using electrospinning and thermal annealing process, which is different annealing temperature ( 400℃, 600℃ ) and gas concentration ( 20%, 100% ) to study the sensing effect . Based on tuning the fabrication process, the different defect energy levels can be formed due to the various oxygen vacancy structures. In addition, the grain size and the amount of interface/surface oxygen vacancies have strong infection to affect the photon and gas detection.

In this work, the different defect energy levels can absorb multi-wavelength ( 365 nm, 465 nm, 520 nm, and 580 nm ) LED light to excite the trapping electron on defect levels to form photon electric current sensing. The rich surface/interface oxygen vacancies of Poly-SnO2 NFs also can be powerful units to enhance the toxic gas (NO(g)) detect ability. The defect energy levels effect can be further investigated by changing the relative humidity to see the difference of the NO(g) sensing performance of Poly-SnO2 NFs. Based on this research, the well detection Poly-SnO2 NFs can be formed through a series parameter controlling to achieve various application, such as photon and toxic gas sensing.

Keywords: Tin oxide nano-fibers, oxygen vacancy, photon sensing, toxic gas sensing, humidity