Observations of two-dimensional monolayer zinc oxide

Sahoo, Trilochan; Nayak, Sanjeev K.; Chelliah, Pandian; Rath, Manasa K.; Parida, Bhaskar

doi:10.1016/j.materresbull.2015.11.043

Cited by 44 publications

(25 citation statements)

References 26 publications

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“…For example, Tusche et al first obtained the g‐ZnO bilayer by growing it on Ag (111) surface. Sahoo et al synthesized the monolayer one using the hydrothermal growth technique. Quang et al successfully prepared the free‐standing mono‐ and bilayer g‐ZnO membranes suspended in graphene pores.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, another type of nanostructure of ZnO, namely, the atomic‐thinned g‐ZnO monolayer, was theoretically predicted and experimentally realized . It has the honeycomb structure very similar to that of single‐layered hexagonal boron nitride (h‐BN), with the band gap predicted to be 3.57–5.64 eV, larger than the one of the bulk wurtzite ZnO .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of Gas Molecules on Graphene‐Like ZnO Nanosheets: The Roles of Gas Concentration, Layer Number, and Heterolayer

Meng

Lü

Ingebrandt

et al. 2017

Adv Materials Inter

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ZnO also has a multitude of 1D nanomorphologies, [3,4] for example, nanowires, [5] nanotubes, [6] nanorods, [7] nanoribbons, [8] etc. This versatile functional material has attracted significant research attention because of its excellent properties such as sizable direct band gap of ≈3.3 eV and large exciton binding energy of 60 meV and so on, which make it an excellent candidate for a variety of applications like piezoelectric devices, [9] light emitting diodes, [10] biosensors, [11] catalysis, [12] etc. Apart from those applications, ZnO has also been extensively investigated as gas sensors, in particular, the 1D ZnO nanostructures exhibit much higher sensitivity than the polycrystalline bulk ones owing to the high surface-to-volume ratio. [13][14][15][16][17] Recently, another type of nanostructure of ZnO, namely, the atomic-thinned g-ZnO monolayer, was theoretically predicted [18,19] and experimentally realized. [20][21][22] It has the honeycomb structure very similar to that of single-layered hexagonal boron nitride (h-BN), with the band gap predicted to be 3.57-5.64 eV, larger than the one of the bulk wurtzite ZnO. [23] As the mutual merit shared by the 2D materials, [24][25][26][27][28][29][30] monolayer g-ZnO has even larger surface area than its 1D counterparts with the same volume. Inspired by the previous researches of unique gas adsorption performance of various 2D materials, [26,[31][32][33][34][35][36][37][38][39][40][41][42][43] it is of scientific interests to investigate the gas adsorption performance of g-ZnO and explore its suitability to be gas sensing materials. However, relevant systematical investigations of gas adsorption performance of pristine g-ZnO are relatively scarce. [44,45] In this paper, we employ first principle calculations based on the density functional theory (DFT) to gain fundamental insights into the interaction between gas molecules and pristine g-ZnO. This study mainly focuses on the following questions: (i) What is the adsorption behavior of the common atmospheric (CO 2 , H 2 O, and O 2 ) and toxic (CO, H 2 S, NH 3 , SO 2 , NO, and NO 2 ) gas molecules on g-ZnO? (ii) Will the adsorption strength be affected by the gas concentration? (iii) What is the impact of the layer numbers of g-ZnO on the adsorption? (iv) Do the heterolayers or substrates have effects on the adsorption? To solve the issues above, we utilized different supercell sizes of g-ZnO to simulate the gas concentration effect, that is, a large supercell gives rise to lower gas density. Besides, we also 2D layered materials have gained tremendous research interests for gas sensing applications because of their ultrahigh theoretical specific surface areas and unique electronic properties, which are prone to be influenced by external factors. Here, using first principle calculations, the adsorption of several common gas molecules on graphene-like ZnO (g-ZnO) is systematically studied by taking the gas concentration, homolayer number, and heterolayers into considerations. The calculation results show that the a...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of Gas Molecules on Graphene‐Like ZnO Nanosheets: The Roles of Gas Concentration, Layer Number, and Heterolayer

Meng

Lü

Ingebrandt

et al. 2017

Adv Materials Inter

View full text Add to dashboard Cite

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“…A solution-based approach for the synthesis of g-ZnO has recently been reported by Sahoo et al [24]. In that work, g-ZnO structures were synthesized using a mild hydrothermal technique.…”

Section: Hydrothermal Growthmentioning

confidence: 99%

Graphene-Like ZnO: A Mini Review

Zhao

Pohl

et al. 2016

Crystals

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Abstract:The isolation of a single layer of graphite, known today as graphene, not only demonstrated amazing new properties but also paved the way for a new class of materials often referred to as two-dimensional (2D) materials. Beyond graphene, other 2D materials include h-BN, transition metal dichalcogenides (TMDs), silicene, and germanene, to name a few. All tend to have exciting physical and chemical properties which appear due to dimensionality effects and modulation of their band structure. A more recent member of the 2D family is graphene-like zinc oxide (g-ZnO) which also holds great promise as a future functional material. This review examines current progress in the synthesis and characterization of g-ZnO. In addition, an overview of works dealing with the properties of g-ZnO both in its pristine form and modified forms (e.g., nano-ribbon, doped material, etc.) is presented. Finally, discussions/studies on the potential applications of g-ZnO are reviewed and discussed.

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“…It has a very wide (~3.37 eV) bandgap and can be fabricated defect free by ALD [46]. So far, nanoscale ZnO has clearly demonstrated unique properties as well as excellent electrochemical capabilities in photovoltaics, catalysts, batteries, and different chemical sensors [47][48][49][50][51][52][53]. However, despite outstanding reported properties and wide usage of ZnO in many applications, Au-ZnO heterostructures have not yet been reported for electrochemical H 2 O 2 sensing.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Au-ZnO Heterostructure Developed by Atomic Layer Deposition Towards Amperometric H2O2 Detection

Wei

Verpoort

et al. 2020

Nanoscale Res Lett

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Nanoscale Au-ZnO heterostructures were fabricated on 4-in. SiO 2 /Si wafers by the atomic layer deposition (ALD) technique. Developed Au-ZnO heterostructures after post-deposition annealing at 250°C were tested for amperometric hydrogen peroxide (H 2 O 2) detection. The surface morphology and nanostructure of Au-ZnO heterostructures were examined by field emission scanning electron microscopy (FE-SEM), Raman spectroscopy, atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), etc. Additionally, the electrochemical behavior of Au-ZnO heterostructures towards H 2 O 2 sensing under various conditions is assessed by chronoamperometry and electrochemical impedance spectroscopy (EIS). The results showed that ALD-fabricated Au-ZnO heterostructures exhibited one of the highest sensitivities of 0.53 μA μM −1 cm −2 , the widest linear H 2 O 2 detection range of 1.0 μM-120 mM, a low limit of detection (LOD) of 0.78 μM, excellent selectivity under the normal operation conditions, and great long-term stability. Utilization of the ALD deposition method opens up a unique opportunity for the improvement of the various capabilities of the devices based on Au-ZnO heterostructures for amperometric detection of different chemicals.

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Observations of two-dimensional monolayer zinc oxide

Cited by 44 publications

References 26 publications

Adsorption of Gas Molecules on Graphene‐Like ZnO Nanosheets: The Roles of Gas Concentration, Layer Number, and Heterolayer

Adsorption of Gas Molecules on Graphene‐Like ZnO Nanosheets: The Roles of Gas Concentration, Layer Number, and Heterolayer

Graphene-Like ZnO: A Mini Review

Nanoscale Au-ZnO Heterostructure Developed by Atomic Layer Deposition Towards Amperometric H2O2 Detection

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