Unravelling the room temperature growth of two-dimensional h-BN nanosheets for multifunctional applications

Biswas, Abhijit; Maiti, Rishi; Lee, Frank; Chen, Cecilia Y.; Li, Tao; Puthirath, Anand B.; Iyengar, Sathvik Ajay; Li, Chenxi; Zhang, Xiang; Kannan, Harikishan; Gray, Tia; Saadi, M. A. S. R.; Elkins, Jacob; Birdwell, A. Glen; Neupane, Mahesh R.; Shah, Pankaj B.; Ruzmetov, Dmitry; Ivanov, Tony; Vajtai, Róbert; Zhao, Yuji; Gaeta, Alexander L.; Dalton, Alan B.; Ajayan, Pulickel M.

doi:10.1039/d2nh00557c

Cited by 5 publications

(9 citation statements)

References 72 publications

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“…Figure presents the static and dynamic WCA of freshly exfoliated hBN samples. The static WCA value was found to be 64 ± 5°, which is consistent with some previous reports. ,, The advancing WCA was found to be 79 ± 3°, while the receding WCA was found to be 43 ± 4°. It is worth noting that no prior research reported experimental values of advancing and receding WCAs of freshly exfoliated hBN, likely due to the very small size and hBN crystal available …”

Section: Resultsmentioning

confidence: 99%

“…Numerous techniques, for the preparation of graphene, have been used to date to synthesize hBN nanosheets, ,, including exfoliation methods from bulk materials (e.g., mechanical, chemical, thermal, etc. ), intercalation approaches, solid and liquid phase sonification methods, mechanical milling techniques, chemical solution derived (CSD) techniques, CVD, and PLD. − ,,,, It is important to note that the synthesis of high-quality hBN is still very challenging and the quality of the resulting nanosheets is yet to be improved. The bulk hBN crystals produced thus far have exhibited lower quality and smaller dimensions in comparison to those of highly ordered pyrolytic graphite (HOPG).…”

Section: Introductionmentioning

confidence: 99%

“…30 Similarly, using an alternative hBN synthesis approach, Biswas et al grew hBN nanosheets on an aluminum oxide (Al 2 O 3 ) substrate at room temperature using a highly energetic pulsed laser deposition (PLD) technique, yielding a WCA of 60°. 20 However, Keerthi et al conducted a time-dependent static WCA analysis on mechanically exfoliated bulk hBN, employing 6 M LiCl aqueous solutions and a PicoPump to generate small droplets with an approximate diameter of 100 μm. Notably, the mechanical exfoliation of hBN led to an initial WCA measurement of approximately 83°, which is very different from previously reported results of 60−67°though it is unclear what is the effect of LiCl.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Experimental and theoretical WCA data of hBN. Triangle symbols represent experimental data on monolayer (1L) and multilayer (ML) hBN supported by various substrates: ML-boron nitride (BN) film, , 1L-hBN on Cu, 1L-hBN on Ge, ML-hBN on Ni, ML-hBN on Si/SiO 2 , and ML-hBN on Al 2 O 3 . Square symbols represent computationally calculated WCA for 1L-hBN, double-layer hBN (2L-hBN), and bulk hBN. ,,− …”

Section: Introductionmentioning

confidence: 99%

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Understanding the Intrinsic Water Wettability of Hexagonal Boron Nitride

Yang,

McQuain,

Kumari

et al. 2024

Langmuir

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The water wettability of hexagonal boron nitride (hBN) has attracted a lot of research interest in the past 15 years. Experimentally, the static water contact angle (WCA) has been widely utilized to characterize the intrinsic water wettability of hBN.In the current study, we have investigated the effect of airborne hydrocarbons and defects on both static and dynamic WCAs of hBN. Our results showed that the static WCA is impacted by defects, which suggests that previously reported static WCAs do not characterize the intrinsic water wettability of hBN since the state-of-the-art hBN samples always have relatively high defect density. Instead, we found that the advancing WCA of freshly exfoliated hBN is not affected by the defects and airborne hydrocarbons. As a result, the advancing WCA on freshly exfoliated hBN, determined to be 79 ± 3°, best represents the intrinsic water wettability of hBN. A qualitative model has been proposed to describe the effect of airborne hydrocarbons and defects on the static and dynamic WCA of hBN, which is well supported by the experimental results. The finding here has important implications for the water wettability of 2D materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Understanding the Intrinsic Water Wettability of Hexagonal Boron Nitride

Yang,

McQuain,

Kumari

et al. 2024

Langmuir

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“…In recent years, two-dimensional materials, such as MOX [13,14], TMDs [15,16], h-BN [17,18], MXenes [19,20] are widely studied. Among them, two-dimensional transition metal carbon/nitride (MXenes) materials are excellent candidates for device applications due to their excellent stability, electrical conductivity and capacitance [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The first-principles study on the magnetic and electronic properties of Janus Cr-based MXene

Sun,

Zong,

Yang

et al. 2024

Phys. Scr.

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Using the first-principles calculations, the geometric, magnetic and electronic properties of two-dimensional Janus MXenes Cr2CAB (A/B = F, O, OH) were investigated. The results show that Cr2COF, Cr2CO(OH) and Cr2CF(OH) all exhibit A-type antiferromagnetic. The Janus MXene Cr2CO(OH) and Cr2COF are half-metals with the atomic orbital of Cr-d and O-p states contributing to the metal states at the Fermi level in spin up channel. However, Cr2CF(OH) is a semiconductor. Bader charge and geometric structure analyses show that the electron transfer number difference between the O2- and F-/OH- groups and the bond length difference between Cr-O and Cr-OH/F lead to an unequal interaction at the two ends, resulting in a transition from semiconductor properties of Cr2CT2 (T = F, OH) to half-metal of Cr2CAB (A = O; B = F, OH). These findings highlight the importance of surface groups on tuning the magnetic and electronic properties of MXene, which benefits to the applications of two-dimensional Janus MXenes in spintronics.

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Recent Advances on Pulsed Laser Deposition of Large‐Scale Thin Films

Yu,

Han,

Suleiman

et al. 2023

Small Methods

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Abstract2D thin films, possessing atomically thin thickness, are emerging as promising candidates for next‐generation electronic devices, due to their novel properties and high performance. In the early years, a wide variety of 2D materials are prepared using several methods (mechanical/liquid exfoliation, chemical vapor deposition, etc.). However, the limited size of 2D flakes hinders their fundamental research and device applications, and hence the effective large‐scale preparation of 2D films is still challenging. Recently, pulsed laser deposition (PLD) has appeared to be an impactful method for wafer‐scale growth of 2D films, owing to target‐maintained stoichiometry, high growth rate, and efficiency. In this review, the recent advances on the PLD preparation of 2D films are summarized, including the growth mechanisms, strategies, and materials classification. First, efficacious strategies of PLD growth are highlighted. Then, the growth, characterization, and device applications of various 2D films are presented, such as graphene, h‐BN, MoS2, BP, oxide, perovskite, semi‐metal, etc. Finally, the potential challenges and further research directions of PLD technique is envisioned.

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Unravelling the room temperature growth of two-dimensional h-BN nanosheets for multifunctional applications

Abstract: Room temperature growth of two-dimensional van der Waals (2D-vdW) materials is indispensable for state-of-the-art nanotechnology as it supersedes the requirement of elevated growth temperature accompanied with additional high thermal budgets,...

Cited by 5 publications

References 72 publications

Understanding the Intrinsic Water Wettability of Hexagonal Boron Nitride

Understanding the Intrinsic Water Wettability of Hexagonal Boron Nitride

The first-principles study on the magnetic and electronic properties of Janus Cr-based MXene

Recent Advances on Pulsed Laser Deposition of Large‐Scale Thin Films

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