title: Comparative NO2-sensing in cobalt and metal-free porphyrin nanotubes.
abstract: In the present study, the nanotubes of 5-(4-hydroxyphenyl)-10, 15, 20-tri(4-chlorophenyl) porphyrin (p-HTClPP) (1) and 5-(4-hydroxyphenyl)-10, 15, 20-tri(4-chlorophenyl) porphyrin cobalt (p-HTClPPCo) (2) were successfully prepared by using anodize alumina oxide (AAO) template method. The p-HTClPP and p-HTClPPCo nanotubes have been confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), electronic absorption spectra, fluorescence spectroscopy, fourier transform infrared spectroscopy (FT-IR), low-angle X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) techniques. Both p-HTClPPCo and p-HTClPP nanotubes showed excellent sensitivity, reproducibility and selectivity toward NO2. Especially the prepared sensor of p-HTClPPCo nanotubes exhibited faster response/recovery characteristics and lower detection limit of NO2(up to 500ppb) than that of p-HTClPP nanotubes, which pave a new avenue in the gas sensitive field.
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Yucheng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China; Jinan Academy of Agricultural Sciences, Jinan 250316, PR China.
authors.forename: Pan
authors.initials: P
authors.lastname: Ma
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Feifei
authors.initials: F
authors.lastname: Song
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Shuncheng
authors.initials: S
authors.lastname: Yao
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
authors.forename: Changlong
authors.initials: C
authors.lastname: Chen
authors.affiliation: Key Laboratory of Chemical Sensing & Analysis in University of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: chm_zhuph@ujn.edu.cn.
authors.forename: Peihua
authors.initials: P
authors.lastname: Zhu
keywords: Cobalt porphyrin; Gas sensing performance; NO(2); Nanotubes; Porphyrin