Polymorphism as an additional functionality of materials for technological applications at surfaces and interfaces

Gentili, Denis; Gazzano, Massimo; Melucci, Manuela; Jones, Derek; Cavallini, Massimiliano

doi:10.1039/c8cs00283e

Cited by 113 publications

(125 citation statements)

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“…Polymorphism is of great interest in many fields, including medicine, materials science, catalysis, and electronics, because different forms exhibit dramatically different physical and chemical properties 3 . MnTe is a well-known polymorphic compound 4,5 .…”

Section: Introductionmentioning

confidence: 99%

Reversible displacive transformation in MnTe polymorphic semiconductor

Mori

Hatayama

et al. 2020

Nat Commun

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Displacive transformation is a diffusionless transition through shearing and shuffling of atoms. Diffusionless displacive transition with modifications in physical properties can help manufacture fast semiconducting devices for applications such as data storage and switching. MnTe is known as a polymorphic compound. Here we show that a MnTe semiconductor film exhibits a reversible displacive transformation based on an atomic-plane shuffling mechanism, which results in large electrical and optical contrasts. We found that MnTe polycrystalline films show reversible resistive switching via fast Joule heating and enable nonvolatile memory with lower energy and faster operation compared with conventional phase-change materials showing diffusional amorphous-to-crystalline transition. We also found that the optical reflectance of MnTe films can be reversibly changed by laser heating. The present findings offer new insights into developing low power consumption and fast-operation electronic and photonic phase-change devices.

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Section: Introductionmentioning

confidence: 99%

Reversible displacive transformation in MnTe polymorphic semiconductor

Mori

Hatayama

et al. 2020

Nat Commun

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“…The crystallisation of small molecule OSCs can lead to a variety of polymorphs due to the interplay of weak intermolecular interactions, which give rise to different device properties. 17,18 The formation of a specific thin film polymorph can be controlled by modifying the coating experimental conditions. For instance, tuning the speed, temperature and ink formulation in solution shearing depositions has been demonstrated to impact on the molecular packing.…”

Section: Introductionmentioning

confidence: 99%

Selection of the two enantiotropic polymorphs of diF-TES-ADT in solution sheared thin film transistors

et al. 2020

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“…Different polymorphs may also exhibit different fluorescence colors, and several fluorescent polymorphic materials whose altered emission between two states under stimuli can be controlled and reversibly switched through interconversion between polymorphs have been reported [15][16][17][18][19] . Despite many potential applications in different areas, such as pigment, sensor, and technology industries, there are only few examples of systems displaying color polymorphism reported in the literature.…”

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confidence: 99%

Color polymorphism in organic crystals

2020

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Color polymorphism is an interesting property of chemical systems which present crystal polymorphs of different colors. It is a rare phenomenon, with only a few examples reported in the literature hitherto. Nevertheless, systems exhibiting color polymorphism have many potential applications in different domains, such as pigment, sensor, and technology industries. Here, known representative chemical systems showing color polymorphism are reviewed, and the reasons for them to present such property discussed. Also, since some of the concepts related to color polymorphism have been frequently used imprecisely in the scientific literature, this article provides concise, systematic definitions for these concepts. T his paper focuses on color polymorphism, a fascinating property exhibited by chemical systems that present polymorphs showing different colors. In the first few sections, unambiguous definitions of the structural properties and of the relevant physical concepts related with this subject will be provided, since some of them have been frequently used in an imprecise way in the scientific literature. Then, the physicochemical reasons leading to color polymorphism will be described briefly using an essentially phenomenological approach. The last few sections of this paper will survey representative chemical systems showing color polymorphism. Terminology Polymorphism. In the crystallographic context, polymorphism, from the Greek poly (many) and morphe (form), also known as crystal polymorphism, refers to the ability of a certain compound to exist in different crystallographic structures, resulting from different packing arrangements of its molecules in the crystal structure 1. It is worth to differentiate between polymorphism and allotrophism. While the latter term describes the existence of different crystal structures of the same element, polymorphism is used regarding different crystalline structures of compounds. It is also important to mention that in this review, one will not consider solvates, hydrates, or dynamic isomers (including geometric isomers and tautomers) as polymorphic phases, but instead, as pseudopolymorphic states. Hence, a safe criterion for the classification of a system as polymorphic would be if the crystal structures are different but give rise to the same liquid and vapor states. Why is polymorphism so important? The main reason is that although being composed of the same compound, different polymorphic structures can behave as different materials 2. Indeed, in

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Polymorphism as an additional functionality of materials for technological applications at surfaces and interfaces

Abstract: This tutorial aims to divulge to the chemistry community the information that polymorphism can be directly exploited as a property in a variety of technological applications.

Cited by 113 publications

References 49 publications

Reversible displacive transformation in MnTe polymorphic semiconductor

Reversible displacive transformation in MnTe polymorphic semiconductor

Selection of the two enantiotropic polymorphs of diF-TES-ADT in solution sheared thin film transistors

Color polymorphism in organic crystals

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