1
|
Razzhivina ME, Rukhlenko ID, Tepliakov NV. Chiral Optical Properties of Möbius Graphene Nanostrips. J Phys Chem Lett 2023; 14:4426-4432. [PMID: 37141489 DOI: 10.1021/acs.jpclett.3c00925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The advancement of optical technology demands the development of chiral nanostructures with a strong dissymmetry of optical response. Here, we comprehensively analyze the chiral optical properties of circular twisted graphene nanostrips, with a particular emphasis on the case of a Möbius graphene nanostrip. We use the method of coordinate transformation to analytically model the electronic structure and optical spectra of the nanostrips, while employing the cyclic boundary conditions to account for their topology. It is found that the dissymmetry factors of twisted graphene nanostrips can reach 0.01, exceeding the typical dissymmetry factors of small chiral molecules by 1-2 orders of magnitude. The results of this work thus demonstrate that twisted graphene nanostrips of Möbius and similar geometries are highly promising nanostructures for chiral optical applications.
Collapse
Affiliation(s)
- Marina E Razzhivina
- Information Optical Technologies Center, ITMO University, Saint Petersburg 197101, Russia
| | - Ivan D Rukhlenko
- Information Optical Technologies Center, ITMO University, Saint Petersburg 197101, Russia
- School of Physics, Institute of Photonics and Optical Science, The University of Sydney, Camperdown, NSW 2006, Australia
| | - Nikita V Tepliakov
- Department of Materials and The Thomas Young Centre for Theory and Simulation of Materials, Imperial College London, London SW7 2AZ, United Kingdom
| |
Collapse
|
2
|
Vovk IA, Lobanov VV, Litvin AP, Leonov MY, Fedorov AV, Rukhlenko ID. Band Structure and Intersubband Transitions of Three-Layer Semiconductor Nanoplatelets. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:nano10050933. [PMID: 32408535 PMCID: PMC7279220 DOI: 10.3390/nano10050933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 04/29/2020] [Accepted: 05/07/2020] [Indexed: 06/11/2023]
Abstract
This paper presents the first general theory of electronic band structure and intersubband transitions in three-layer semiconductor nanoplatelets. We find a dispersion relation and wave functions of the confined electrons and use them to analyze the band structure of core/shell nanoplatelets with equal thicknesses of the shell layers. It is shown that the energies of electrons localized inside the shell layers can be degenerate for certain electron wave vectors and certain core and shell thicknesses. We also show that the energies of intersubband transitions can be nonmonotonic functions of the core and shell thicknesses, exhibiting pronounced local minima and maxima which can be observed in the infrared absorption spectra. Our results will prove useful for the design of photonic devices based on multilayered semiconductor nanoplatelets operating at infrared frequencies.
Collapse
Affiliation(s)
- Ilia A. Vovk
- ITMO University, Center of Information Optical Technology, Saint Petersburg 197101, Russia; (I.A.V.); (V.V.L.); (A.P.L.); (M.Y.L.); (A.V.F.)
| | - Vladimir V. Lobanov
- ITMO University, Center of Information Optical Technology, Saint Petersburg 197101, Russia; (I.A.V.); (V.V.L.); (A.P.L.); (M.Y.L.); (A.V.F.)
| | - Aleksandr P. Litvin
- ITMO University, Center of Information Optical Technology, Saint Petersburg 197101, Russia; (I.A.V.); (V.V.L.); (A.P.L.); (M.Y.L.); (A.V.F.)
| | - Mikhail Yu. Leonov
- ITMO University, Center of Information Optical Technology, Saint Petersburg 197101, Russia; (I.A.V.); (V.V.L.); (A.P.L.); (M.Y.L.); (A.V.F.)
| | - Anatoly V. Fedorov
- ITMO University, Center of Information Optical Technology, Saint Petersburg 197101, Russia; (I.A.V.); (V.V.L.); (A.P.L.); (M.Y.L.); (A.V.F.)
| | - Ivan D. Rukhlenko
- The University of Sydney, Institute of Photonics and Optical Science (IPOS), School of Physics, Camperdown, NSW 2006, Australia
| |
Collapse
|
3
|
Masteri-Farahani M, Mollatayefeh N. Chiral colloidal CdSe quantum dots functionalized with cysteine molecules: New optical nanosensor for selective detection and measurement of morphine. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.02.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
4
|
Bloom BP, Liu R, Zhang P, Ghosh S, Naaman R, Beratan DN, Waldeck DH. Directing Charge Transfer in Quantum Dot Assemblies. Acc Chem Res 2018; 51:2565-2573. [PMID: 30289241 DOI: 10.1021/acs.accounts.8b00355] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The optical and electronic properties of semiconductor quantum dots (QDs) make them attractive candidates for applications in photovoltaics, spintronics, photocatalysis, and optoelectronics. Understanding how to control the flow of charge in QD assemblies is essential for realizing novel applications. This Account explores some unique characteristics of charge transport in QD dyads, triads, and their assemblies. The emerging features of these assemblies that provide new opportunities to manipulate charge flow at the nanoscale are (1) cascading energy landscapes and band offsets to inhibit charge recombination, (2) electrostatic fields that direct charge flow through QD-QD and QD-conjugated polymer junctions, and (3) QD chirality and chiral imprinting that promotes vectorial electron and spin selective transport. Charge flow kinetics is determined by a combination of familiar electron transfer parameters (reaction free energy, reorganization energy, and electronic coupling), donor and acceptor electronic densities of states, and internal electric fields. Electron transfer and electronic structure theory, combined with kinetic modeling, place the measured kinetics of QD electron transfer donor-acceptor assemblies into a unified conceptual context. The experimental transfer rates measured in these systems depend upon structure and the internal electric fields that are present in the assemblies. A negatively charged donor and positively charged acceptor, for example, facilitates (inhibits) electron (hole) transfer, while an electric field of opposite orientation (reversal of charges) inhibits (promotes) electron (hole) transfer. These and other emerging rules that govern charge flow in NP assemblies provide a strategy to design the directionality and yield of interfacial charge transport. Chirality at the nanoscale can induce spin selective charge transport, providing new ways to direct charge (and spin) flow in QD assemblies. Magnetoresistance and magnetic conductive probe atomic force microscopy experiments show spin selective electron transport for chirally imprinted QD assemblies. Photoinduced electron transfer from achiral donor-QDs to chiral acceptor-QDs depends on the electron spin and chiroptical properties of the acceptor-QDs. These assemblies show transport characteristics that correlate with features of the QDs' circular dichroism spectra, presenting intriguing challenges to theory, and indicating that spectroscopic signatures may assist in the design and diagnosis of functional molecular assemblies. Theoretical and experimental studies of charge transport in well-defined QD assemblies are establishing design principles for vectorial charge transport and are also refining questions surrounding the mechanism and control of these processes. These intensified efforts are forging links between fundamental discoveries regarding mechanism and practical applications for these novel assembled nanostructures.
Collapse
Affiliation(s)
- Brian P. Bloom
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ruibin Liu
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Peng Zhang
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Supriya Ghosh
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 76100, Israel
| | - David N. Beratan
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
- Department of Physics, Duke University, Durham, North Carolina 27708, United States
- Department of Biochemistry, Duke University, Durham, North Carolina 27710, United States
| | - David H. Waldeck
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
5
|
Cheng J, Hao J, Liu H, Li J, Li J, Zhu X, Lin X, Wang K, He T. Optically Active CdSe-Dot/CdS-Rod Nanocrystals with Induced Chirality and Circularly Polarized Luminescence. ACS NANO 2018; 12:5341-5350. [PMID: 29791135 DOI: 10.1021/acsnano.8b00112] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Ligand-induced chirality in semiconductor nanocrystals (NCs) has attracted attention because of the tunable optical properties of the NCs. Induced circular dichroism (CD) has been observed in CdX (X = S, Se, Te) NCs and their hybrids, but circularly polarized luminescence (CPL) in these fluorescent nanomaterials has been seldom reported. Herein, we describe the successful preparation of l- and d-cysteine-capped CdSe-dot/CdS-rods (DRs) with tunable CD and CPL behaviors and a maximum anisotropic factor ( glum) of 4.66 × 10-4. The observed CD and CPL activities are sensitive to the relative absorption ratio of the CdS shell to the CdSe core, suggesting that the anisotropic g-factors in both CD and CPL increase to some extent for a smaller shell-to-core absorption ratio. In addition, the molar ratio of chiral cysteine to the DRs is investigated. Instead of enhancing the chiral interactions between the chiral molecules and DRs, an excess of cysteine molecules in aqueous solution inhibits both the CD and CPL activities. Such chiral and emissive NCs provide an ideal platform for the rational design of semiconductor nanomaterials with chiroptical properties.
Collapse
Affiliation(s)
- Jiaji Cheng
- College of Physics and Energy , Shenzhen University , Shenzhen 518060 , China
| | - Junjie Hao
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Haochen Liu
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Jiagen Li
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Junzi Li
- College of Physics and Energy , Shenzhen University , Shenzhen 518060 , China
| | - Xi Zhu
- School of Science and Engineering , The Chinese University of Hong Kong , Shenzhen 518172 , China
| | - Xiaodong Lin
- College of Physics and Energy , Shenzhen University , Shenzhen 518060 , China
| | - Kai Wang
- Department of Electrical and Electronic Engineering , Southern University of Science and Technology , Shenzhen 518055 , China
| | - Tingchao He
- College of Physics and Energy , Shenzhen University , Shenzhen 518060 , China
| |
Collapse
|
6
|
Tepliakov NV, Vovk IA, Baimuratov AS, Leonov MY, Baranov AV, Fedorov AV, Rukhlenko ID. Optical Activity of Semiconductor Gammadions beyond Planar Chirality. J Phys Chem Lett 2018; 9:2941-2945. [PMID: 29767981 DOI: 10.1021/acs.jpclett.8b01334] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present rigorous analysis of optical activity of chiral semiconductor gammadions whose chirality in three dimensions is caused by the nonuniformity of thickness in the transverse plane. It is shown that such gammadions not only distinguish between the two circular polarizations upon scattering and reflection of light, like all two-dimensional semiconductor nanostructures with planar chirality do, but also exhibit circular dichroism and circularly polarized luminescence. Chiral semiconductor gammadions whose charge carriers are mostly confined to the arms are found to feature both high dissymmetry of optical response and a constant-sign circular dichroism signal over a wide frequency range. It is also shown that the strength of the gammadion's chiroptical response is determined solely by two geometric factors: the variation range of the gammadion's thickness and the arms' curvature. Our seminal theoretical study is intended to lay the foundation for future applications of semiconductor gammadions in chiral nanophotonics and nanotechnology.
Collapse
Affiliation(s)
- Nikita V Tepliakov
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Ilia A Vovk
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Anvar S Baimuratov
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Mikhail Yu Leonov
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Alexander V Baranov
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Anatoly V Fedorov
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| | - Ivan D Rukhlenko
- Information Optical Technologies Centre , ITMO University , Saint Petersburg 197101 , Russia
| |
Collapse
|
7
|
Purcell-Milton F, McKenna R, Brennan LJ, Cullen CP, Guillemeney L, Tepliakov NV, Baimuratov AS, Rukhlenko ID, Perova TS, Duesberg GS, Baranov AV, Fedorov AV, Gun'ko YK. Induction of Chirality in Two-Dimensional Nanomaterials: Chiral 2D MoS 2 Nanostructures. ACS NANO 2018; 12:954-964. [PMID: 29338193 DOI: 10.1021/acsnano.7b06691] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Two-dimensional (2D) nanomaterials have been intensively investigated due to their interesting properties and range of potential applications. Although most research has focused on graphene, atomic layered transition metal dichalcogenides (TMDs) and particularly MoS2 have gathered much deserved attention recently. Here, we report the induction of chirality into 2D chiral nanomaterials by carrying out liquid exfoliation of MoS2 in the presence of chiral ligands (cysteine and penicillamine) in water. This processing resulted in exfoliated chiral 2D MoS2 nanosheets showing strong circular dichroism signals, which were far past the onset of the original chiral ligand signals. Using theoretical modeling, we demonstrated that the chiral nature of MoS2 nanosheets is related to the presence of chiral ligands causing preferential folding of the MoS2 sheets. There was an excellent match between the theoretically calculated and experimental spectra. We believe that, due to their high aspect ratio planar morphology, chiral 2D nanomaterials could offer great opportunities for the development of chiroptical sensors, materials, and devices for valleytronics and other potential applications. In addition, chirality plays a key role in many chemical and biological systems, with chiral molecules and materials critical for the further development of biopharmaceuticals and fine chemicals, and this research therefore should have a strong impact on relevant areas of science and technology such as nanobiotechnology, nanomedicine, and nanotoxicology.
Collapse
|
8
|
Puri M, Ferry VE. Circular Dichroism of CdSe Nanocrystals Bound by Chiral Carboxylic Acids. ACS NANO 2017; 11:12240-12246. [PMID: 29164858 DOI: 10.1021/acsnano.7b05690] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chiral semiconductor nanocrystals, or quantum dots (QDs), are promising materials for applications in biological sensing, photonics, and spin-polarized devices. Many of these applications rely on large dissymmetry, or g-factors, the difference in absorbance between left- and right-handed circularly polarized light compared to the unpolarized absorbance. The majority of chiral QDs, specifically CdSe, reported to date have used thiolated amino acid ligands to introduce chirality onto the nanoparticles, but these systems have ultimately reported small g-factors of ∼2 × 10-4. In an effort to realize chiral CdSe QDs with higher g-factors and to expand the set of designer chiral semiconductor nanocrystals, we have employed chiral carboxylic acids as a distinct class of ligands for chiral CdSe nanoparticles. Through this family of chiral carboxylic acid ligands, we performed a direct comparison between carboxylate-bound and thiolate-bound chiral CdSe QDs. Spectral analysis revealed that the resulting circular dichroism shifts originate from the splitting of the exciton by the ligand-nanocrystal interaction. Subsequent examination of a series of chiral carboxylic acid ligands revealed a 30-fold range in g-factor through relatively small changes in the structure of the ligand. Finally, we showed that increasing the number of stereocenters on the ligand can further enhance the dissymmetry factors. This versatile and tunable combination of nanocrystals and ligands will inform future designs of chiral nanomaterials and their applications.
Collapse
Affiliation(s)
- Mayank Puri
- Department of Chemical Engineering and Materials Science University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| | - Vivian E Ferry
- Department of Chemical Engineering and Materials Science University of Minnesota , 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
9
|
Tepliakov NV, Baimuratov AS, Vovk IA, Leonov MY, Baranov AV, Fedorov AV, Rukhlenko ID. Chiral Optical Properties of Tapered Semiconductor Nanoscrolls. ACS NANO 2017; 11:7508-7515. [PMID: 28696663 DOI: 10.1021/acsnano.7b04032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Large surface-to-volume ratio, one-dimensional quantum confinement, and strong optical activity make chiral nanoscrolls ideal for the detection and sensing of small chiral molecules. Here, we present a simple physical model of chiroptical phenomena in multilayered tapered semiconductor nanoscrolls. Our model is based on a linear transformation of coordinates, which converts nanoscrolls into flat but topologically distorted nanoplatelets whose optical properties can then be treated analytically. As an illustrative application example, we analyze absorption and circular dichroism spectra of CdSe nanoscrolls using an eight-band model of CdSe. We show that the optical activity of the nanoscrolls originates from the chiral distortion of their crystal lattice and determine selection rules for the optically active interband transitions. The results of our study may prove useful for the modeling and design of semiconductor nanoscrolls and nanoscroll-based materials.
Collapse
Affiliation(s)
- Nikita V Tepliakov
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Anvar S Baimuratov
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Ilia A Vovk
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Mikhail Yu Leonov
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Alexander V Baranov
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Anatoly V Fedorov
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
| | - Ivan D Rukhlenko
- Center of Information Optical Technologies, ITMO University , Saint Petersburg 197101, Russia
- Monash University , Clayton Campus, Clayton, Victoria 3800, Australia
| |
Collapse
|