Assembly of mesoscale helices with near-unity enantiomeric excess and light-matter interactions for chiral semiconductors

Feng, Wenchun; Kim, Ji-Young; Wang, Xinzhi; Calcaterra, Heather A.; Qu, Zhi‐bei; Meshi, Louisa; Kotov, Nicholas A.

doi:10.1126/sciadv.1601159

Cited by 150 publications

(185 citation statements)

References 79 publications

(112 reference statements)

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“…Ordered and complex architectures have been constructed from NPs of noble metals and other compounds, [97][98][99][100][101][102][103][104] but it is still challenging to organize PBA NPs into such superstructures. [105] Nai et al explored a novel strategy to assemble anisotropic Co-Fe PBA NPs into open frame-like superstructures in a one-pot synthesis.…”

Section: Complex Hollow Structuresmentioning

confidence: 99%

Hollow Structures Based on Prussian Blue and Its Analogs for Electrochemical Energy Storage and Conversion

2018

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Due to their special structural characteristics, hollow structures grant fascinating physicochemical properties and widespread applications, especially in electrochemical energy storage and conversion. Recently, the research of Prussian blue (PB) and its analog (PBA) related nanomaterials has emerged and has drawn considerable attention because of their low cost, facile preparation, intrinsic open framework, and tunable composition. Here, the recent progress in the study of PB- and PBA-based hollow structures for electrochemical energy storage and conversion are summarized and discussed. First, some remarkable examples in the synthesis of hollow structures from PB- and PBA-based materials are illustrated in terms of the structural architectures, i.e., closed single-shelled hollow structures, open hollow structures, and complex hollow structures. Thereafter, their applications as potential electrode materials for lithium-/sodium-ion batteries, hybrid supercapacitors, and electrocatalysis are demonstrated. Finally, the current achievements in this field together with the limits and urgent challenges are summarized. Some perspectives on the potential solutions and possible future trends are also provided.

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Section: Complex Hollow Structuresmentioning

confidence: 99%

Hollow Structures Based on Prussian Blue and Its Analogs for Electrochemical Energy Storage and Conversion

2018

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“…Therefore, the preparation of functional materials based on DNAbridged NP assemblies for use in practical applications does not currently leverage the advances in understanding from these model studies. In a different vein, the spontaneous assemblies of many thousands of anisotropic NPs modified driven by often subtle differences in their interaction reached a level of sophistication comparable to biological systems in respect to geometrical complexities and functions 26,27 . These strides can be made when we partially relax the requirements for structural determinism and rely on dynamic collective interactions of NPs that we have only begun to understand 28 .…”

Section: State Of the Field And Outstanding Questionsmentioning

confidence: 99%

Nanoparticle Assembly:A Perspective and some Unanswered Questions

et al. 2017

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In early 2016, the Royal Society of Chemistry arranged a meeting on the topic 'NanoparticleKeywords: Function-driven design, fundamental issues, nanoparticle assembly, practical applications. NANOPARTICLE assemblies are encountered in a wide variety of practical applications. For example, over 70% of the approximately 12 million metric tonnes of carbon black nanoparticles (NPs) produced annually goes into rubber compounds used in automotive tyres 2,3 . Controlling carbon NP assembly in the nanocomposite is critical to the performance of the tyre and remains an active area of research. Spontaneous organization of the nanoscale platelets of clay into stacks and higher order structures is the key for balancing their mechanical performance and scalability 4 . Last but not the least, self-organization represent a quintessential biomimetic characteristic of inorganic NPs that leads to numerous implementations in drug delivery, biosensing, biotechnology and even agriculture. The use of colorimetric biosensors based on gold NP assembly is widespread (and growing), thanks to advances in the chemistry of coupling molecules to gold surfaces. Controlling the process of NP assembly and the resultant structure is critical to not only these uses, but also for applications in catalysis, in conversion of solar energy, and for creating materials with unique optical and optoelectronic properties. The assembly of NPs into chains followed by oriented attachment leads to lattice connectivity between initially separated inorganic grains 5,6 . This effect is essential for the energy storage devices 7,8 . What does 'control over NP assembly' entail

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“…One is to determine the concentration of each enantiomer after chiral separation . The other is to measure the enantiomeric excess (ee) with a circular dichroism (CD) detector . The combination of achiral high‐performance liquid chromatography (HPLC) separation and CD detection has shown advantages in chiral analysis .…”

Section: Introductionmentioning

confidence: 99%

“…Analysis of chiral composition is crucial in the research areas of pharmaceutical, agrochemical, environmental, life, food, and material sciences. [1][2][3][4][5][6][7][8] Two applicable approaches are commonly used for chiral composition analysis. One is to determine the concentration of each enantiomer after chiral separation.…”

Section: Introductionmentioning

confidence: 99%

Deviations from Beer's law in electronic absorption and circular dichroism: Detection for enantiomeric excess analysis

et al. 2019

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The electronic absorption (UV) to circular dichroism (CD) signal ratio can be used for enantiomeric excess (ee) analysis within linear range. However, CD detection often requires a high sample concentration where deviations from Beer's law may occur. Individual enantiomers of four chiral compounds were separated from commercial racemates by semipreparative high‐performance liquid chromatography (HPLC) with chiral columns. They were used to trace possible deviations in both UV and CD detection on achiral HPLC with a photodiode array detector and a CD detector. The CD/UV ratios for samples with the same ee value decreased by up to 7.8 to 52% when the injection volume increased, indicating that the linear standard curve of ee versus CD/UV is only valid within a narrow range. To extend the sample amount to a wider range, a data‐processing method was developed based on two second‐order polynomial functions, which were constructed to fit the relationship between the intensities of the UV and CD signals for two enantiomers. Moreover, a more simplified method based on a third‐order polynomial function was established to calculate the ee values. The variations between the predicted and experimental ee values were within ±0.08 for both methods. To our knowledge, this is the first study that the deviations from Beer's law are considered in both UV and CD detection for ee analysis.

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Assembly of mesoscale helices with near-unity enantiomeric excess and light-matter interactions for chiral semiconductors

Abstract: Mesoscale CdTe helices with near-unity enantiomeric excess offer insight into design rules for chiroptical semiconductor materials.

Cited by 150 publications

References 79 publications

Hollow Structures Based on Prussian Blue and Its Analogs for Electrochemical Energy Storage and Conversion

Hollow Structures Based on Prussian Blue and Its Analogs for Electrochemical Energy Storage and Conversion

Nanoparticle Assembly:A Perspective and some Unanswered Questions

Deviations from Beer's law in electronic absorption and circular dichroism: Detection for enantiomeric excess analysis

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