High Throughput Investigation of an Emergent and Naturally Abundant 2D Material: Clinochlore

Oliveira, Raphaela de; Guallichico, Luis A. G.; Policarpo, Eduardo; Cadore, Alisson R.; Freitas, Raul O.; Silva, Francisco M. C. da; Teixeira, Verônica C.; Paniago, R.; Chacham, H.; Matos, Matheus J. S.; Malachias, A.; Barcelos, Ingrid D.

doi:10.2139/ssrn.3995894

Cited by 1 publication

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“…Pristine phlogopite ('colorless' , Fe-free crystal) is a hydrated phyllosilicate of potassium (K) and magnesium (Mg) with chemical formula KMg 3 AlSi 3 O 10 (OH) 2 , while the Feendmember ('brown' mineral) is the annite mineral (KFe 3 AlSi 3 O 10 (OH) 2 ), and the biotite mineral can be seen as a Fe-rich crystal with chemical formula (K(Mg,Fe) 3 AlSi 3 O 10 (OH) 2 ) [24,25,56]. However, in natural materials the existence of impurities such as Fe ions in their crystal lattice is reported in [13,[57][58][59]. Consequently, it is common to observe Fe:phlogopite crystals (light and dark brown minerals) with different Fe ions concentrations [37,41,59].…”

Section: Resultsmentioning

confidence: 99%

“…Layered materials (LMs) [1], for which graphene is the prime example, have obtained vast attention in the last years. So far, more than 1800 LMs have been computationally identified [2][3][4], while many of them have been naturally obtained or synthesized [5][6][7][8][9][10][11][12][13]. Thus, as soon as a new LM is identified, the investigation of its optical, mechanical and electrical properties is promptly examined [14].…”

Section: Introductionmentioning

confidence: 99%

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Exploring the structural and optoelectronic properties of natural insulating phlogopite in van der Waals heterostructures

Cadore¹,

Oliveira²,

Lobato³

et al. 2022

2D Mater.

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Naturally occurring van der Waals crystals have brought unprecedented interest to nanomaterial researchers in recent years. So far, more than 1800 layered materials (LMs) have been identified but only a few insulating and naturally occurring LMs were deeply investigated. Phyllosilicate minerals, which are a class of natural and abundant LMs, have been recently considered as a low-cost source of insulating nanomaterials. Within this family an almost barely explored material emerges: phlogopite [KMg3(AlSi3)O10(OH)2]. Here we carry out a high throughput characterization of this LM by employing several experimental techniques, corroborating the major findings with first-principles calculations. We show that monolayers (1L) and few-layers of this material are air and temperature stable, as well as easily obtained by the standard mechanical exfoliation technique, have an atomically flat surface, and lower bandgap than its bulk counterpart, an unusual trend in LMs. We also systematically study the basic properties of ultrathin phlogopite and demonstrate that natural phlogopite presents iron impurities in its crystal lattice, which decreases its bandgap from about 7 eV to 3.6 eV. Finally, we combine phlogopite crystals with 1L-WS2 in ultrathin van der Waals heterostructures and present a photoluminescence study, revealing a significant enhancement on the 1L-WS2 optical quality (i.e., higher recombination efficiency through neutral excitons) similarly to that obtained on 1L-WS2/hBN heterostructures. Our proof-of-concept study shows that phlogopite should be regarded as a good and promising candidate for LM-based applications as a low-cost layered nanomaterial.

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