Luminescence of Nanodiamond Driven by Atomic Functionalization: Towards Novel Detection Principles

Abstract

from single photon producing nitrogenvacancy (NV) color centers consisting of a substitutional nitrogen atom next to a vacancy that is engineered artificially in the diamond lattice. The nanoscale effects related to artificially engineered NV color centers attracted important attention to diamond due to applications ranging from quantum computing to cell imaging. [2][3][4] The luminescence from NV centers is extremely stable without any photobleaching or photoblinking [5][6][7] and compared to better known quantum dots, ND brings additional advantages such as high biocompatibility [8,9] and simple C-surface chemistry. [10,11] This allows grafting of biomolecules that are interesting for cellular targeting [12,13] or biomolecular drug delivery. [14][15][16] However, for very small ND particles (5 nm) blinking of NV centers was observed, [17] showing that the surface effects are of importance for stabilization of NV luminescence properties.Here we describe how the surface chemistry effects can make the ND bulk luminescence sensitive to chemical processes ongoing at the ND surface, with the aim of using ND for monitoring a chemical environment such as surface charges or pH, cellular DNA/RNA hybridization, interaction with cell receptors, etc. The proposed method is based on the control of an electronic chemical potential at the

Increased negatively charged nitrogen-vacancy centers in fluorinated diamond

“…[6][7][8][9] Hydrogen is less electronegative than carbon, and thus a hydrogenterminated diamond surface exhibits a negative electron affinity. Adsorbed water layers on the surface accept electrons, and this electron transfer bends the surface bands upwards, resulting in hole accumulation at the surface and a primarily NV 0 population.…”

Diamond-based electrodes for organic photovoltaic devices

“…Notably, the Fano resonance just quenches the diamond line and does not mean a worsening of diamond quality. Raman spectra of boron-doped diamond layers grown with different amounts of TMB (4,8,12) and for different deposition times (2,3,4). The spectra were excited by 488 nm laser radiation and offset for clarity.…”

“…With respect to photovoltaic devices, light-harvesting materials can be directly manufactured by the PECVD process [7,8]. Diamond is recognized to be a remarkable material due to its particularly attractive properties combining chemical resistance, optical transparency, thermal conductivity [9][10][11][12][13], and electrochemical properties [14][15][16][17][18]. Once successfully doped, diamond, which is generally recognized as an insulating material, becomes a wide-band gap semiconductor material with excellent potential due to the unique combination of its physical and electronic properties.…”

“…Higher boron concentrations typically result in conductive systems with electrical properties comparable to metallic materials; also, superconductivity was reported by Ekimov et al [13] in heavily B-doped diamond. There are also other parameters which influence boron-doped diamond layer charge transport properties -namely, the electronic structures of boron defects, the morphology of the nanodiamond layer (the addition of boron has a strong influence on the morphology of the layers grown [12][13][14]20]), and the relative amount of sp 2 and sp 3 hybridized carbon in the nanodiamond layer [29][30][31]. The optimization of growth conditions at high boron/carbon ratios (up to 8000ppm in the gas phase during growth) can lead to low sheet resistance comparable to, or even lower than the best ITO samples.…”

Lumineszcencia centrumok kialakítása és spektrális jellemzése nanogyémántban

“…A nagyenergiájú részecskével történő besugárzás a szerkezet roncsolását eredményezi [135]. A roncsolás mértéke nő az ionenergiával és az implantált ionok mennyiségével.…”