Ion sensors with crown ether-functionalized nanodiamonds
- URL: http://arxiv.org/abs/2301.03143v1
- Date: Mon, 9 Jan 2023 01:54:52 GMT
- Title: Ion sensors with crown ether-functionalized nanodiamonds
- Authors: Changhao Li, Shao-Xiong Lennon Luo, Daniel M. Kim, Guoqing Wang and
Paola Cappellaro
- Abstract summary: Nitrogen-vacancy (NV) centers in diamond are particularly attractive as fluorescence markers.
We build sensors that are capable of detecting specific alkali ions such as sodium cations.
- Score: 7.940330955124415
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Alkali metal ions such as sodium and potassium cations play fundamental roles
in biology. Developing highly sensitive and selective methods to both detect
and quantify these ions is of considerable importance for medical diagnostics
and bioimaging. Fluorescent nanoparticles have emerged as powerful tools for
nanoscale imaging, but their optical properties need to be supplemented with
specificity to particular chemical and biological signals in order to provide
further information about biological processes. Nitrogen-vacancy (NV) centers
in diamond are particularly attractive as fluorescence markers, thanks to their
optical stability, biocompatibility and further ability to serve as highly
sensitive quantum sensors of temperature, magnetic and electric fields in
ambient conditions. In this work, by covalently grafting crown ether structures
on the surface of nanodiamonds (NDs), we build sensors that are capable of
detecting specific alkali ions such as sodium cations. We will show that the
presence of these metal ions modifies the charge state of NV centers inside the
ND, which can then be read out by measuring their photoluminescence spectrum.
Our work paves the way for designing selective biosensors based on NV centers
in diamond.
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