Nano interface potential influences in CdTe quantum dots and biolabeling

Abstract

Nano interface influences in physiochemical properties of quantum dots (QDs) are the challenging approach to tailor its surface functionalities. In this study, a set of polar and non-polar solvents were selected to analyze the influences in solventbased dynamic radius and surface potential of QDs. From the nano interface chemistry of polar and non-polar solvents, an appropriate mechanism of precipitation and hydrophobic ligand exchange strategy were elucidated by correlating Henry's equation. Further, the in vitro cytotoxic potential and antimicrobial activity of QDs were assessed to perform biolabeling. From the observations, an appropriate dosage of QDs was fixed to label the animal ((RAW 264.7 cell lines) and bacterial cells (Escherichia coli) for effective cell attachment. Biolabeling was achieved by tailoring nano interface chemistry of QDs without additional support of biomolecules. Bacterial cell wall-based interaction of QDs was evaluated using SEM and EDAX analysis. Thus, provided clear insights into the nano interface chemistry in the development of highly photostable QDs will be helpful in biomedical applications.

Bioinspired multicolour carbon dots: comprehensive cytotoxicity, phytotoxicity, and bioimaging in animal cells and plants

“…These results indicated that both synthesized CDs were negatively charged, as in previous CD studies [16], however the PBS‐based CDs were coated with more negatively charged polar groups in comparison with the ethanol 20%‐based CDs. This fact probably is related to the chemical structure differences of their synthesis solvents, such as the amount of O − /O–H structures in each solvent [33] which was also confirmed by FTIR spectra. Concerning CDs morphology, AFM displayed a diameter of ~3 nm for the PBS‐based CDs and 5 nm for the ethanol 20%‐based CDs (Figure 1c).…”

Upconversion nanotubes with tunable fluorescence properties based on Gd 2 O 2 S:Ln 3+ (Ln 3+ = Yb 3+ , Er 3+ ) and derivatives for photodynamic therapy

“…However, some electrons at the 4 F 9/2 level can be further excited to the 2H 9/2 level or electrons at the 4 G 11/2 level non-radiatively relax to the 2 H 9/2 level, as described in Fig. 6b (7), (8). Subsequent radiative decay of the excited electrons at the 2 H 9/2 level to the 4 I 15/2 should lead to the enhancement in the peak intensity of the peak at 414 nm.…”

“…With the recent advances in nanotechnology and molecular biology, nanobiotechnology has developed rapidly over the past few years [1][2][3]. In particular, the design and development of multifunctional nanomaterials for biomedical applications provide an unprecedented opportunity for simultaneous diagnosis and therapy of diseases [4][5][6][7][8]. Indeed, luminescent nanomaterials, including Si nanoparticles [6], semiconducting quantum dots [8,9], carbon dots [10], and nanodiamonds [11], have recently attracted a great deal of interest for biomedical imaging, diagnose and diseases therapy.…”

“…In particular, the design and development of multifunctional nanomaterials for biomedical applications provide an unprecedented opportunity for simultaneous diagnosis and therapy of diseases [4][5][6][7][8]. Indeed, luminescent nanomaterials, including Si nanoparticles [6], semiconducting quantum dots [8,9], carbon dots [10], and nanodiamonds [11], have recently attracted a great deal of interest for biomedical imaging, diagnose and diseases therapy. Due to the unique luminescence properties arising from the intra 4f and 4f-5d electron transitions of different lanthanide ions, lanthanide-doped luminescent nanomaterials have been demonstrated to show tunable emitting properties with a relatively low biotoxicity useful for biomedical applications [12,13].…”

Carbon quantum dots‐embedded electrospun antimicrobial and fluorescent scaffold for reepithelialization in albino wistar rats

“…The photophysical properties of CQDs help to obtain photokilling effect to control bacterial growth via photoinduced redox oxidation process (Dong et al, 2017). The recent study suggests that surface charge‐based interaction of CQDs with microbes can induce potential antibacterial activity on other hand neutral charge CQDs were inefficient (Kanagasubbulakshmi & Kadirvelu, 2018). Though the CQDs possess less toxicity on the animal cells, the antibacterial activity surprises the researchers due to its size‐ and charge‐based interaction with the microbial system.…”