| Autor: |
González-Martínez E; Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada., Rekas A; Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada., Moran-Mirabal J; Department of Chemistry and Chemical Biology, McMaster University, Hamilton, ON L8S 4M1, Canada.; School of Biomedical Engineering, McMaster University, Hamilton, ON L8S 4M1, Canada.; Centre for Advanced Light Microscopy, McMaster University, Hamilton, ON L8S 4M1, Canada.; Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON L8S 4M1, Canada. |
| Abstrakt: |
Paper has emerged as an excellent alternative to create environmentally benign disposable electrochemical sensing devices. The critical step to fabricating electrochemical sensors is making paper conductive. In this work, paper-based electrodes with a high electroactive surface area (ESA) were fabricated using a simple electroless deposition technique. The polymerization time of a polydopamine adhesion layer and the gold salt concentration during the electroless deposition step were optimized to obtain uniformly conductive paper-based electrodes. The optimization of these fabrication parameters was key to obtaining the highest ESA possible. Roughening factors ( R f ) of 7.2 and 2.3 were obtained when cyclic voltammetry was done in sulfuric acid and potassium ferricyanide, respectively, demonstrating a surface prone to fast electron transfer. As a proof of concept, mercury detection was done through anodic stripping, achieving a limit of quantification (LOQ) of 0.9 ppb. By changing the metal deposition conditions, the roughness of the metalized papers could also be tuned for their use as surface-enhanced Raman scattering (SERS) sensors. Metallized papers with the highest SERS signal for thiophenol detection yielded a LOQ of 10 ppb. We anticipate that this method of fabricating nanostructured paper-based electrodes can accelerate the development of simple, cost-effective, and highly sensitive electrochemical and SERS sensing platforms. |
