AI Article Synopsis
- This study introduces innovative hemispherical atomic force microscopy (AFM) sensors, enhanced with platinum-black, designed for detecting hydrogen peroxide effectively.
- The sensors have a small geometric footprint but benefit from a porous structure, providing a large electroactive surface area for enhanced detection capabilities.
- The research also highlights the sensors' ability for precise in situ measurements and electrochemical force spectroscopy, achieving detection limits in the nanomolar range and showcasing their versatility for imaging and studying photocatalyst films.
Article Abstract
In this work, we present (hemi)spherical atomic force microscopy (AFM) sensors for the detection of hydrogen peroxide. Platinum-black (Pt-B) was electrodeposited onto conductive colloidal AFM probes or directly at recessed microelectrodes located at the end of a tipless cantilever, resulting in electrocatalytically active cantilever-based sensors that have a small geometric area but, due to the porosity of the films, exhibit a large electroactive surface area. Focused ion beam-scanning electron microscopy tomography revealed the porous 3D structure of the deposited Pt-B. Given the accurate positioning capability of AFM, these probes are suitable for local in situ sensing of hydrogen peroxide and at the same time can be used for (electrochemical) force spectroscopy measurements. Detection limits for hydrogen peroxide in the nanomolar range (LOD = 68 ± 7 nM) were obtained. Stability test and first in situ proof-of-principle experiments to achieve the electrochemical imaging of hydrogen peroxide generated at a microelectrode and at photocatalytically active structured poly(heptazine imide) films are demonstrated. Force spectroscopic data of the photocatalyst films were recorded in ambient conditions, in solution, and by applying a potential, which demonstrates the versatility of these novel Pt-B-modified spherical AFM probes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10902814 | PMC |
| http://dx.doi.org/10.1021/acs.analchem.3c03957 | DOI Listing |
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