CdSe and CdSe(ZnS) quantum dots in 2D: A Langmuir monolayer approach

Crawford, Nicholas F.; Leblanc, Roger M.

doi:10.1016/j.ccr.2013.07.023

Cited by 25 publications

(15 citation statements)

References 65 publications

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“…As mentioned previously, by controlling the surface charge on the materials, to ideally be greater than ± 30 meV, monolayers can rapidly be adsorbed to oppositely charged surfaces. The LBL layering strategy has proven to be a common methodology employed to achieve QD biofunctionalization in sensor applications [ 62 , 74 , 75 ], with monolayer formations comparable to that of Langmuir-Blodgett deposition [ 76 ]. The ease of deposition of QD systems has made sensor platforms feasible in both the aqueous suspension and solid substrate forms, allowing for the utilization of the inherent QD sensor mechanisms in virtually any environment.…”

Section: Semiconductor Quantum Dotsmentioning

confidence: 99%

Recent Advances in the Field of Bionanotechnology: An Insight into Optoelectric Bacteriorhodopsin, Quantum Dots, and Noble Metal Nanoclusters

Knoblauch

Griep

Friedrich

2014

Sensors

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Molecular sensors and molecular electronics are a major component of a recent research area known as bionanotechnology, which merges biology with nanotechnology. This new class of biosensors and bioelectronics has been a subject of intense research over the past decade and has found application in a wide variety of fields. The unique characteristics of these biomolecular transduction systems has been utilized in applications ranging from solar cells and single-electron transistors (SETs) to fluorescent sensors capable of sensitive and selective detection of a wide variety of targets, both organic and inorganic. This review will discuss three major systems in the area of molecular sensors and electronics and their application in unique technological innovations. Firstly, the synthesis of optoelectric bacteriorhodopsin (bR) and its application in the field of molecular sensors and electronics will be discussed. Next, this article will discuss recent advances in the synthesis and application of semiconductor quantum dots (QDs). Finally, this article will conclude with a review of the new and exciting field of noble metal nanoclusters and their application in the creation of a new class of fluorescent sensors.

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Section: Semiconductor Quantum Dotsmentioning

confidence: 99%

Recent Advances in the Field of Bionanotechnology: An Insight into Optoelectric Bacteriorhodopsin, Quantum Dots, and Noble Metal Nanoclusters

Knoblauch

Griep

Friedrich

2014

Sensors

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“…Regarding the interaction of quantum dots (QDs) with biological material such as proteins [ 10 ] or cells [ 11 ] at air/water interfaces, extensive research works have been reported by using the Langmuir monolayer approach [ 12 ] and using surface pressure-area isotherms and in situ UV-vis absorption and fluorescence spectroscopy as characterization techniques. The use of QDs in combination with Langmuir monolayers, which serves as model membranes, can be beneficial when it comes to study neurodegenerative diseases such as Alzheimer’s disease.…”

Section: Introductionmentioning

confidence: 99%

Study of Fluorinated Quantum Dots-Protein Interactions at the Oil/Water Interface by Interfacial Surface Tension Changes

et al. 2018

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Understanding the interaction of nanoparticles with proteins and how this interaction modifies the nanoparticles’ surface is crucial before their use for biomedical applications. Since fluorinated materials are emerging as potential imaging probes and delivery vehicles, their interaction with proteins of biological interest must be studied in order to be able to predict their performance in real scenarios. It is known that fluorinated planar surfaces may repel the unspecific adsorption of proteins but little is known regarding the same process on fluorinated nanoparticles due to the scarce examples in the literature. In this context, the aim of this work is to propose a simple and fast methodology to study fluorinated nanoparticle-protein interactions based on interfacial surface tension (IFT) measurements. This technique is particularly interesting for fluorinated nanoparticles due to their increased hydrophobicity. Our study is based on the determination of IFT variations due to the interaction of quantum dots of ca. 5 nm inorganic core/shell diameter coated with fluorinated ligands (QD_F) with several proteins at the oil/water interface. Based on the results, we conclude that the presence of QD_F do not disrupt protein spontaneous film formation at the oil/water interface. Even if at very low concentrations of proteins the film formation in the presence of QD_F shows a slower rate, the final interfacial tension reached is similar to that obtained in the absence of QD_F. The differential behaviour of the studied proteins (bovine serum albumin, fibrinogen and apotransferrin) has been discussed on the basis of the adsorption affinity of each protein towards DCM/water interface and their different sizes. Additionally, it has been clearly demonstrated that the proposed methodology can serve as a complementary technique to other reported direct and indirect methods for the evaluation of nanoparticle-protein interactions at low protein concentrations.

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“…Nowadays, the set of compounds that are used for assembling ultrathin planar systems comprises not only classical aliphatic surfactants, but also almost all classes of organic compounds from polyaromatic ones [4] to complex supramolecular complexes [5], pro teins [2,6], and even nanoparticles [7][8][9]. The contin uous growth of the functional diversity of Langmuir monolayers and LB films is dictated by the Kuhn par adigm [10], which underlay the LB based sensing methods and, to a high extent, predetermined the character of this field of research for several decades ahead.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of metastable langmuir monolayers on planar solid surfaces

Kalinina

2015

Colloid J

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For several decades, the method of Langmuir monolayers and the Langmuir-Blodgett technique have been unique instruments for the formation and study of ordered ultrathin films, the structure of which can be controlled at the molecular level. In spite of the wide variety of problems relevant to the study of such systems and the diversity of their functional characteristics, the methodological approach to their preparation has remained unchanged for almost a hundred years. When assembling Langmuir-Blodgett films, most of researchers try to achieve a perfect mono or multilayer system on a solid substrate, with exactly reproduced and preserved structural characteristics of a Langmuir monolayer organized on a liquid surface. Nevertheless, in addition to the traditional approach to the preparation of molecularly ordered Langmuir-Blodgett films, a new field of research associated with the self organization of Langmuir monolayers under the action of a moving solid substrate has been developed. The self assembly of this type is based on the use of nonequilib rium structural and phase transitions in metastable Langmuir monolayers brought in contact with a solid sur face. These transitions are accompanied by the spontaneous formation of periodically ordered structures ("patterns") with sizes of elements varying from a few tens of nanometers to several hundreds of microns. This review offers an opportunity for the readers to gain insight into different types of the solid modified self orga nization of Langmuir monolayers using the currently known examples of systems based on lipids, fatty acids, bases, and mixtures thereof. In this review, contemporary ideas are discussed concerning the metastability of Langmuir monolayers, formation mechanisms of periodic patterns in monolayers on solid surfaces, possible practical applications of such systems, and the perspectives of this new and interesting field of the physical chemistry of thin films.

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CdSe and CdSe(ZnS) quantum dots in 2D: A Langmuir monolayer approach

Cited by 25 publications

References 65 publications

Recent Advances in the Field of Bionanotechnology: An Insight into Optoelectric Bacteriorhodopsin, Quantum Dots, and Noble Metal Nanoclusters

Recent Advances in the Field of Bionanotechnology: An Insight into Optoelectric Bacteriorhodopsin, Quantum Dots, and Noble Metal Nanoclusters

Study of Fluorinated Quantum Dots-Protein Interactions at the Oil/Water Interface by Interfacial Surface Tension Changes

Self-assembly of metastable langmuir monolayers on planar solid surfaces

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