Au Nanospirals Transferred onto PDMS Film Exhibiting Circular Dichroism at Visible Wavelengths

Furusawa, Gaku; Kan, Tetsuo

doi:10.3390/mi11070641

Cited by 5 publications

(5 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chiral features in metal nanoparticles (NP) result in chiroptical properties, of interest to many applications, such as enantioselective catalysis or separation, chiral sensing, drug delivery, and the generation of circularly polarized light (CPL). − These applications arise from the different interactions of chiral plasmonic NPs with left- and right-handed CPL. Therefore, much effort has been put into the development of NPs with complex structures and morphologies. − The properties of such nanomaterials are usually characterized by measuring their circular dichroism (CD), which quantifies the interaction of an ensemble of particles with CPL . Under certain conditions, such measurements can also be performed for single nanoparticles, which may help account for heterogeneity in morphology and optical response. − Multiple factors can be at the origin of the recorded CD signal, such as a chiral morphology, chiral features in the crystalline structure, or the presence of chiral molecules at or near the surface of the chiral NPs. ,,− To obtain NPs with tailored chiroptical properties, it is thus important to understand the connection between the CD signal and the NP morphology.…”

mentioning

confidence: 99%

Quantification of the Helical Morphology of Chiral Gold Nanorods

Heyvaert

Pedrazo‐Tardajos

Kadu

et al. 2022

ACS Materials Lett.

View full text Add to dashboard Cite

Chirality in inorganic nanoparticles and nanostructures has gained increasing scientific interest, because of the possibility to tune their ability to interact differently with left- and right-handed circularly polarized light. In some cases, the optical activity is hypothesized to originate from a chiral morphology of the nanomaterial. However, quantifying the degree of chirality in objects with sizes of tens of nanometers is far from straightforward. Electron tomography offers the possibility to faithfully retrieve the three-dimensional morphology of nanomaterials, but only a qualitative interpretation of the morphology of chiral nanoparticles has been possible so far. We introduce herein a methodology that enables us to quantify the helicity of complex chiral nanomaterials, based on the geometrical properties of a helix. We demonstrate that an analysis at the single particle level can provide significant insights into the origin of chiroptical properties.

show abstract

mentioning

confidence: 99%

Quantification of the Helical Morphology of Chiral Gold Nanorods

Heyvaert

Pedrazo‐Tardajos

Kadu

et al. 2022

ACS Materials Lett.

View full text Add to dashboard Cite

show abstract

“…Additionally, Mendoza-Rincon et al [28] recently presented how the substrate rotation affects the roughness in Zr thin films grown using the GLAD technique. However, in the vast majority of papers, homemade or custom-made GLAD systems are presented [29][30][31][32][33][34][35][36][37]. In these cases, the possibility of being widely used in industrial processes is lowered.…”

Section: Introductionmentioning

confidence: 99%

Developing GLAD Parameters to Control the Deposition of Nanostructured Thin Film

Bronicki

Grochala

Rydosz

2022

Sensors

View full text Add to dashboard Cite

In this paper, we describe the device developed to control the deposition parameters to manage the glancing angle deposition (GLAD) process of metal-oxide thin films for gas-sensing applications. The GLAD technique is based on a set of parameters such as the tilt, rotation, and substrate temperature. All parameters are crucial to control the deposition of nanostructured thin films. Therefore, the developed GLAD controller enables the control of all parameters by the scientist during the deposition. Additionally, commercially available vacuum components were used, including a three-axis manipulator. High-precision readings were tested, where the relative errors calculated using the parameters provided by the manufacturer were 1.5% and 1.9% for left and right directions, respectively. However, thanks to the formula developed by our team, the values were decreased to 0.8% and 0.69%, respectively.

show abstract

“…Moreover, conformation of melectin and antapin antimicrobial peptides was studied in environments simulating eukaryotic and bacterial membranes by using CD spectroscopy ( Kocourková et al, 2017 ). Furusawa and Kan, (2020) , on the other hand, evaluated the ECD spectra of a single-layered circular dichroic film constructed by transferring Au nanospiral structures onto a flexible and transparent polydimethylsiloxane (PDMS) thin film. Excitingly, the results suggested the applicability of the film as a circular dichroic filter having CD peak of −830 mdeg at 630 nm.…”

Section: Introductionmentioning

confidence: 99%

Polarimetric Measurements of Surface Chirality Based on Linear and Nonlinear Light Scattering

2021

View full text Add to dashboard Cite

A molecule, molecular aggregate, or protein that cannot be superimposed on its mirror image presents chirality. Most living systems are organized by chiral building blocks, such as amino acids, peptides, and carbohydrates, and any change in their molecular structure (i.e., handedness or helicity) alters the biochemical and pharmacological functions of the molecules, many of which take place at surfaces. Therefore, studying surface chirogenesis at the nanoscale is fundamentally important and derives various applications. For example, since proteins contain highly ordered secondary structures, the intrinsic chirality can be served as a signature to measure the dynamics of protein adsorption and protein conformational changes at biological surfaces. Furthermore, a better understanding of chiral recognition and separation at bio-nanointerfaces is helpful to standardize chiral drugs and monitor the synthesis of adsorbents with high precision. Thus, exploring the changes in surface chirality with polarized excitations would provide structural and biochemical information of the adsorbed molecules, which has led to the development of label-free and noninvasive measurement tools based on linear and nonlinear optical effects. In this review, the principles and selected applications of linear and nonlinear optical methods for quantifying surface chirality are introduced and compared, aiming to conceptualize new ideas to address critical issues in surface biochemistry.

show abstract

Au Nanospirals Transferred onto PDMS Film Exhibiting Circular Dichroism at Visible Wavelengths

Cited by 5 publications

References 41 publications

Quantification of the Helical Morphology of Chiral Gold Nanorods

Quantification of the Helical Morphology of Chiral Gold Nanorods

Developing GLAD Parameters to Control the Deposition of Nanostructured Thin Film

Polarimetric Measurements of Surface Chirality Based on Linear and Nonlinear Light Scattering

Contact Info

Product

Resources

About