title: A paper indicator for triple-modality sensing of nitrite based on colorimetric assay, Raman spectroscopy, and electron paramagnetic resonance spectroscopy.
abstract: Paper indicators based on colorimetric assays are widely used for nitrite detection, but their application to liquids with strong colours is restricted. We report a novel paper indicator that allows for sensing nitrite by colorimetric assay, Raman spectroscopy, and electron paramagnetic resonance spectroscopy with non-overlapping signal wavelength ranges through non-contact means. The paper indicator was prepared by impregnating poly(4-aminostyrene), 2-naphthol and single-walled carbon nanotubes in a regular filter paper. All three ingredients were essential to realize the triple-modality sensing. This method is simple and inexpensive, and promises to have wider applicability than the existing paper indicators.
authors.affiliation: Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Integrative NanoScience Institute, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida 32310, USA. guan@eng.fsu.edu.
authors.forename: Zhibin
authors.initials: Z
authors.lastname: Wang
authors.forename: Jingfang
authors.initials: J
authors.lastname: Wang
authors.forename: Zhiwei
authors.initials: Z
authors.lastname: Xiao
authors.forename: Junfei
authors.initials: J
authors.lastname: Xia
authors.forename: Peipei
authors.initials: P
authors.lastname: Zhang
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Jingjiao
authors.initials: J
authors.lastname: Guan
mesh_terms: D003124:Colorimetry / Q000379:methods*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D009573:Nitrites / Q000032:analysis*; D013059:Spectrum Analysis, Raman / Q000379:methods*
chemical_list: D009573:Nitrites