An Innovative Metal Ions Sensitive "Test Paper" Based on Virgin Nanoporous Silicon Wafer: Highly Selective to Copper(II).
Developing an innovative "Test Paper" based on virgin nanoporous silicon (NPSi) which shows intense visible emission and excellent fluorescence stability. The visual fluorescence quenching "Test Paper" was highly selective and sensitive recognizing Cu2+at μmol/L level. Within the concentration range of 5 × 10-7~50 × 10-7mol/L, the linear regression equation of IPL= 1226.3-13.6[CCu2+] (R = 0.99) was established for Cu2+quantitative detection. And finally, Cu2+fluorescence quenching mechanism of NPSi prober was proposed by studying the surface chemistry change of NPSi and metal ions immersed-NPSi using XPS characterization. The results indicate that SiHxspecies obviously contribute to the PL emission of NPSi, and the introduce of oxidization state and the nonradiative recombination center are responsible for the PL quenching. These results demonstrate how virgin NPSi wafer can serve as Cu2+sensor. This work is of great significant to promote the development of simple instruments that could realize rapid, visible and real-time detection of various toxic metal ions.
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Shaoyuan
S
Li
Faculty of Physical Science and Technology, Yunnan University, Kunming 650091, China.
Xiuhua
X
Chen
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Wenhui
W
Ma
Department of Mechanical, Materials and Aerospace Engineering, Illinois Institute of Technology, Chicago, USA.
Zhao
Z
Ding
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Cong
C
Zhang
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Zhengjie
Z
Chen
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Xiao
X
He
Faculty of Physical Science and Technology, Yunnan University, Kunming 650091, China.
Yudong
Y
Shang
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization/National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
Yuxin
Y
Zou