High NIR-purity index single-walled carbon nanotubes for electrochemical sensing in microfluidic chips.

摘要: Single-walled carbon nanotubes (SWCNTs) should constitute an important natural step towards the improvement of analytical performance microfluidic electrochemical sensing. SWCNTs inherently offer lower detection potentials, higher surfaces and better stability than existing electrodes. However, pristine contain some carbonaceous metallic impurities that influence their performance. Thus, appropriate processing method is for obtaining high purity applications. In this work, a set 0.1 mg mL−1 SWCNT dispersions with different degrees dispersants (SDBS; pluronic F68 DMF) was carefully characterized by near infrared (NIR) spectroscopy giving Purity Index (NIR-PI) ranging from 0.039 to 0.310. The highest obtained when air oxidized were dispersed in SDBS, followed centrifugation. utilized modify chip electrodes sensing dopamine catechol. comparison non-SWCNT-based electrodes, sample NIR-PI (0.310) exhibited best terms improved sensitivity (3-folds higher), very good signal-to-noise ratio, resistance-to-fouling relative standard deviation (RSD 7%; n = 15), enhanced resolution (2-folds higher). addition, well-defined concentration dependence also excellent correlation coefficients (r ≥ 0.990). Likewise, sensitivity, suitable limits (LODs) precision independence assayed (RSDs ≤ 5%) achieved. These valuable features indicate suitability material quantitative analysis. further TEM XRD characterization demonstrated response driven controlled used. significance work demonstration first time sensitivity–purity relationship chips. A novel tool has been developed: rich surface chemistry functional groups, both essential purposes. Also, helps understand potency coupled chips it opens new gates using these unique real-world