Size-dependent surface CO stretching frequency investigations on nanodiamond particles

Abstract

In this work, the spectroscopic properties of surface functionalized nanodiamond particles are investigated via Fourier transform infrared spectroscopy. The functionalization of the nanodiamond surface was achieved chemically using strong acid treatment method. The size dependent C=O stretching frequency (between 1680 and 1820 cm(-1)) are studied for particle diameter sizes from the 5 to 500 nm range. The surface C=O stretching frequencies at approximately 1820 cm(-1), for large particle size (500 nm), down shifted to 1725 cm(-1) (5 nm) with decreasing particle sizes. We attributed the shift as a result of hydrogen bond formation between the COOH groups in the carboxylated nanodiamond surfaces. Particle size was characterized with dynamic light scattering method and surface morphology of the particles was investigated with scanning electron microscopy. The influence of pH value on C=O stretching frequency is also analyzed. This finding affords useful information for the studying of surface functionalized nanodiamonds with implications for their interaction with biomolecules.

Carboxylated nanodiamond and re‐oxygenation process of gamma irradiated red blood cells

“…The main signature of the effectiveness of the carboxylation process is the presence of the C À À À À O stretching band at around 1720-1740 cm À1 . It was previously reported that the central position of this band shifts from around 1725-1820 cm À1 depending on the NDs size in the 5-300 nm range [33]. Therefore, the observed band position confirms the 5 nm original size of the DNDs.…”

“…The presence of a significant peak at 1728 cm À1 in the cNDs sample could be related to residues from the carboxylation process and also to the conversion of surface oxygenated groups to carboxylic acids [34]. The broad band around 3400 cm À1 and the band around 1630 cm À1 correspond to hydrogen-bonded-OH and O-H bending vibrations, respectively, attributed to adsorbed water on the ND surface [33,35]. The broad band near 3000 cm À1 can be ascribed to the CH stretching of the CH groups formed on the ND surface during the acid treatment [33].…”

Peptide‐Grafted Nanodiamonds: Preparation, Cytotoxicity and Uptake in Cells

“…Treatment of the starting NDs in acidic media led to the introduction of functional groups onto their surface, as attested by the IR spectrum. [19,25] . [26] The band at 1575 cm À1 indicates the presence of primary amines, which are provided by APS.…”

The influence of nanodiamond on the oxygenation states and micro rheological properties of human red blood cells <italic>in vitro</italic>

“…FTIR spectra of these dried samples show the well-resolved line of C ¼ O stretching of carbonyl group on the nanodiamond surface in the range of 1720 to 1780 cm −1 as seen from the previous reports. 22 …”

“…5,22 Fourier transform infrared (FTIR) Spectroscopy (Bomen MB 154, Canada) was used to analyze the cND's surface functional groups. FTIR spectra of these dried samples show the well-resolved line of C ¼ O stretching of carbonyl group on the nanodiamond surface in the range of 1720 to 1780 cm −1 as seen from the previous reports.…”