Towards optical neuromodulation using nitrogen-doped ultrananocrystalline diamond photoelectrodes
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866916297394094080 |
|---|---|
| author | Falahatdoost, Samira Chambers, Andre Stacey, Alastair Prawer, Steven Ahnood, Arman |
| author_facet | Falahatdoost, Samira Chambers, Andre Stacey, Alastair Prawer, Steven Ahnood, Arman |
| contents | Nitrogen-doped ultrananocrystalline diamond (N-UNCD) is a form of diamond electrode with near-infrared photoresponsivity, making it well suited for physiological applications. N-UNCD's photoresponsivity is strongly influenced by its surface. While it is known that oxygen treatment provides a higher photoresponsivity, a better understanding of its surface processes is needed to tailor the material for optical neuromodulation. This work examines the impact of various oxygen treatment methods, with aim of creating oxygen rich surfaces with different chemical and structural properties. Surface characterisation methods along with electrochemical and photoelectrochemical measurements and modelling were used to investigate the films. It was found that oxygen furnace annealing resulted in orders of magnitude improvement in the near-infrared photoresponsivity, to 3.75 +/- 0.05 uA/W. This translates to an approximate 200 times increase in the photocurrent compared to the untreated surface. This enhancement in photocurrent is largely due to the changes in the chemical species present at the surface. The photocurrent is estimated to be sufficient for extra-cellular stimulation of brain neurons within the safe optical exposure limit, positioning N-UNCD as an excellent candidate to be used in next-generation photoelectrodes for photobiomodulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15519 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Towards optical neuromodulation using nitrogen-doped ultrananocrystalline diamond photoelectrodes Falahatdoost, Samira Chambers, Andre Stacey, Alastair Prawer, Steven Ahnood, Arman Applied Physics Materials Science Nitrogen-doped ultrananocrystalline diamond (N-UNCD) is a form of diamond electrode with near-infrared photoresponsivity, making it well suited for physiological applications. N-UNCD's photoresponsivity is strongly influenced by its surface. While it is known that oxygen treatment provides a higher photoresponsivity, a better understanding of its surface processes is needed to tailor the material for optical neuromodulation. This work examines the impact of various oxygen treatment methods, with aim of creating oxygen rich surfaces with different chemical and structural properties. Surface characterisation methods along with electrochemical and photoelectrochemical measurements and modelling were used to investigate the films. It was found that oxygen furnace annealing resulted in orders of magnitude improvement in the near-infrared photoresponsivity, to 3.75 +/- 0.05 uA/W. This translates to an approximate 200 times increase in the photocurrent compared to the untreated surface. This enhancement in photocurrent is largely due to the changes in the chemical species present at the surface. The photocurrent is estimated to be sufficient for extra-cellular stimulation of brain neurons within the safe optical exposure limit, positioning N-UNCD as an excellent candidate to be used in next-generation photoelectrodes for photobiomodulation. |
| title | Towards optical neuromodulation using nitrogen-doped ultrananocrystalline diamond photoelectrodes |
| topic | Applied Physics Materials Science |
| url | https://arxiv.org/abs/2406.15519 |