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Title: Luminescence of Nanodiamond Driven by Atomic Functionalization: Towards Novel Detection Principles
Authors: Petrakova, Vladimira
Taylor, Andrew
Kratochvilova, Irena
Fendrych, Frantisek
Vacik, Jiri
Kucka, Jan
Stursa, Jan
Cigler, Petr
Ledvina, Miroslav
Fiserova, Anna
Kneppo, Peter
Issue Date: 2012
Source: ADVANCED FUNCTIONAL MATERIALS, 22 (4), p. 812-819
Abstract: High biocompatibility, variable size ranging from 5 nm, stable luminescence from its color centers, and simple carbon chemistry for biomolecule grafting make nanodiamond (ND) particles an attractive alternative to molecular dyes for drug-delivery. A novel method is presented that can be used for remote monitoring of chemical processes in biological environments based on color changes from photoluminescent (PL) nitrogen-vacancy (NV) centers in ND. The NV luminescence is driven chemically by alternating the surface chemical potential by interacting atoms and molecules with the diamond surface. Due to the small ND size, the changes of the surface chemical potential modify the electric field profile at the diamond surfaces (i.e., band bending) and intermingle with the electronic NV states. This leads to changes in NV-/NV degrees PL ratio and allows construction of optical chemo-biosensors operating in cells, with PL visible in classical confocal microscopes. This phenomenon is demonstrated on single crystal diamond containing engineered NV centers and on oxidized and hydrogenated ND in liquid physiological buffers for variously sized ND particles. Hydrogenation of NDs leads to quenching of luminescence related to negatively charged (NV-) centers and as a result produces color shifts from NV- (638 nm) to neutral NV degrees (575 nm) luminescence. How the reduction of diamond size increases the magnitude of the NV color shift phenomena is modeled.
Notes: [Petrakova, Vladimira; Kneppo, Peter] Czech Tech Univ, Fac Biomed Engn, Kladno 27201, Czech Republic. [Taylor, Andrew; Kratochvilova, Irena; Fendrych, Frantisek] Acad Sci Czech Republic, Inst Phys, Vvi, Prague 8, Czech Republic. [Vacik, Jiri; Kucka, Jan; Stursa, Jan] Acad Sci Czech Republic, Inst Nucl Phys, Vvi, CZ-25068 Rez, Czech Republic. [Cigler, Petr; Ledvina, Miroslav] Acad Sci Czech Republic, Inst Organ Chem & Biochem, Vvi, CR-16610 Prague 6, Czech Republic. [Fiserova, Anna] Acad Sci Czech Republic, Inst Microbiol, Vvi, CR-14220 Prague 4, Czech Republic. [Nesladek, Milos] Univ Hasselt, IMOMEC Div, IMEC, Inst Mat Res, B-3590 Diepenbeek, Belgium.
Keywords: nanodiamond; nanoparticles; luminescent centers; surface functionalization; molecular imaging;Multidisciplinary Chemistry; Physical Chemistry; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Applied Physics; Condensed Matter Physics; nanodiamond; nanoparticles; luminescent centers; surface functionalization; molecular imaging
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ISSN: 1616-301X
e-ISSN: 1616-3028
DOI: 10.1002/adfm.201101936
ISI #: 000300447500017
Category: A1
Type: Journal Contribution
Validations: ecoom 2013
Appears in Collections:Research publications

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