Silole-infiltrated photonic crystal films as effective fluorescence sensor for Fe3+ and Hg2+.
We develop a highly effective silole-infiltrated photonic crystal (PC) film fluorescence sensor with high sensitivity, good selectivity and excellent reproducibility for Fe(3+) and Hg(2+) ions. Hexaphenylsilole (HPS) infiltrated PCs show amplified fluorescence due to the slow photon effect of PC because the emission wavelength of HPS is at the blue band edge of the selected PC's stopband. The fluorescence can be quenched significantly by Fe(3+)/Hg(2+) ions owing to electron transfer between HPS and metal ions. The amplified fluorescence enhances the sensitivity of detection, with a detection limit of 5 nM for Fe(3+)/Hg(2+) ions. The sensor is negligibly responsive to other metal ions and can easily be reproduced by rinsing with pure water due to the special surface wettability of PC. As a result, a highly effective Fe(3+)/Hg(2+) ions sensor based on HPS-infiltrated PC film has been achieved, which will be important for effective and practical detection of heavy metal ions.
College of Chemistry and Chemical Engineering, Yan'an University, Yan'an, Shaanxi, 716000 (China), Fax: (+86) 10-8262 7566.
Yuqi
Y
Zhang
Xiangdong
X
Li
Loujun
L
Gao
Jianhua
J
Qiu
Liping
L
Heng
Ben Zhong
BZ
Tang
Lei
L
Jiang
D003460:Crystallization; D005290:Ferric Compounds / Q000032:analysis*; D007477:Ions / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D017785:Photons; D012821:Silanes / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
D005290:Ferric Compounds; D007477:Ions; D012821:Silanes; C540376:silole; D008628:Mercury
electron transfer; fluorescence detection; metal ions; photonic crystals; slow photon effect