Preparation and characterization of cellulose paper/polypyrrole/bromophenol blue composites for disposable optical sensors

Full text
Author(s):	Goncalves, Debora Total Authors: 1
Document type:	Journal article
Source:	OPEN CHEMISTRY; v. 14, n. 1, p. 8-pg., 2016-01-01.
Abstract
This manuscript describes a novel approach for the preparation of composites based on cellulose paper (CP) modified with polypyrrole (PPy) and bromophenol blue (BPB) (CP/PPy/BPB). Cellulose fibers are suitable for uniformly retaining the polymer in its doped form, once BPB can be used as a negatively charged dye. The CP/PPy/BPB composites were characterized by Raman Spectroscopy, Scanning Electron Microscopy, Spectroscopy and Dispersive Energy, and X-ray Diffraction. After characterization, they were studied for the quantification of pH and ammonia by diffuse reflectance spectroscopy. Under varying pH, different colors were verified, which ranged from yellow to blue, and an optical response for ammonia at concentrations as high as 25 ppm. The replacement of BPB by bromothymol blue (BTB) did not produce efficient color transitions and showed no sensitivity to changes in pH and ammonia concentration. (AU)

FAPESP's process:	13/14262-7 - Nanostructured films from biologically-relevant materials
Grantee:	Osvaldo Novais de Oliveira Junior
Support Opportunities:	Research Projects - Thematic Grants


FAPESP's process:	14/02766-3 - Epidermal systems for the analysis of biofluids
Grantee:	Debora Goncalves
Support Opportunities:	Scholarships abroad - Research