A simple synthesis of Ga<sub>2</sub>O<sub>3</sub> and GaN nanocrystals

Huang, Enyu; Li, Juxia; Wu, Guangjun; Dai, Weili; Guan, Naijia; Li, Landong

doi:10.1039/c7ra10639d

Cited by 16 publications

(17 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A reflectance fluctuation appears between the wavelength of 300 and 400 nm for LM droplets, which may be due to that the surface Ga 2 O 3 has a unique transmission of the UV light. 45 In the following, the adhesion behavior between the fluorescent particulates and LM marbles was investigated. Figure 2(a-1−2) presented the images of the native oxide tegument which was naturally developed on the surface of a puny microfluorescent LM marble (R = 480 μm) in ambient air.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Liang

Rao

Song

et al. 2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Liquid metal (LM) is of core interest for a wide variety of newly emerging areas. However, the functional materials thus made so far by LM only could display a single silver-white appearance. In this study, colorful LM marbles working like a transformable biomimetic robot were proposed for the first time and fabricated from LM droplets through encasing them with fluorescent nanoparticles. We demonstrated that this unique LM marble can be manipulated into various stable magnificent appearances as one desires and then split and merge among different colors. Such multifunctional LM is capable of responding to the outside electric stimulus and realizing shape transformation and discoloration behaviors as well. Furthermore, the electric stimuli has been successfully introduced to trigger the release of nano/microparticles from the LM, and the mechanism lying behind was clarified. The present fluorescent LM was expected to offer important opportunities for diverse applications, especially in a wide range of functional smart material areas.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The oxidized LM has a lower reflectance of light, so its color was darker when compared with the bare LM. A reflectance fluctuation appears between the wavelength of 300 and 400 nm for LM droplets, which may be due to that the surface Ga 2 O 3 has a unique transmission of the UV light …”

Section: Results and Discussionmentioning

confidence: 99%

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Liang

Rao

Song

et al. 2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The RRs get thinner and smaller as the Ga(NO 3 ) 3 concentration is increased and could be associated with the "zeppelin", 12 "rice" or "spindle-like shape" widely reported in the literature. 12,15,16,21,22,23 The present RR morphology is commonly obtained as the precipitation occurs in acidic medium. Overall, the three types of microrods grown on silicon are significantly tilted with respect to the normal to the substrate surface, as depicted in Figures 1g-i Crystallographic Structure of Microrods.…”

Section: Morphology Andmentioning

confidence: 99%

“…Krehula et al 15 synthesized particles using tetramethylammonium hydroxide (TMAH). Later on, Huang et al 16 described the influence of the ionic strength on the morphological and structural properties of GaOOH particles by varying the sodium nitrate (NaNO 3 ) over Ga(NO 3 ) 3 concentration ratio.…”

Section: ■ Introductionmentioning

confidence: 99%

Chemical Synthesis of β-Ga₂O₃ Microrods on Silicon and Its Dependence on the Gallium Nitrate Concentration

et al. 2020

View full text Add to dashboard Cite

β-Ga 2 O 3 microrods have received in the last years an increasing interest for their integration into solar blind / UV photodetectors and gas sensors. However, their synthesis using a low temperature chemical route in aqueous solution is still under development and the physicochemical processes at work have not been elucidated yet. Here, we develop a double-step process involving the growth of α-GaOOH microrods on silicon using chemical bath deposition and their further structural conversion into β-Ga 2 O 3 microrods by post-deposition thermal treatment. It is revealed that the concentration of gallium nitrate has a drastic effect to tune the morphology, dimensions (i.e. diameter and length), and density of α-GaOOH microrods over a broad range, governing in turn the morphological properties of β-Ga 2 O 3 microrods. The physicochemical processes in aqueous solution are investigated by thermodynamic computations yielding speciation diagrams of Ga(III) species and theoretical solubility plots of GaOOH(s). In particular, the qualitative evolution of the morphological properties of α-GaOOH microrods with the concentration of gallium nitrate is found to be correlated with the supersaturation in the bath and discussed in the light of the standard nucleation and growth theory. Interestingly, the structural conversion following the thermal treatment at 900 °C in air results in the formation of pure β-Ga 2 O 3 microrods without any residual minor phases and with tunable morphology and improved structural ordering. These findings reporting a double-step process to form high quality pure β-Ga 2 O 3 microrods on silicon open many perspectives for their integration onto a large number of substrates for solar blind / UV photo-detection and gas sensing.

show abstract

“…Figure 7 shows the XRD spectra of GaN films that are prepared by electrodeposition. Two peaks that correspond to the reflection of h-GaN are observed at 2θ = 32.7˚ and 36.8˚; these peaks are caused by reflections from the ( 1 100 ) and ( 10 11) planes for the film deposited on the Al plate, respectively [57] [58]. In contrast, a strong peak corresponding to the reflection of (0002) plane is detected at 2θ = 34.4˚ in the diffraction result for the film deposited on Al200HT (Figure 7(b)).…”

Section: Electrodeposition and Characterizationmentioning

confidence: 99%

Effect of Heat Treatment of Al Substrate on GaN Film Electrodeposited in Aqueous Solution

Kang¹,

Kuroda²,

Okido³

2020

JSEMAT

View full text Add to dashboard Cite

Most reports on the fabrication of high-quality Gallium nitride (GaN) are typically based on physical techniques that require very expensive equipment. Therefore, the electrodeposition was adopted and examined to develop a simple and economical method for GaN synthesis. GaN films are synthesized on aluminum substrates that are heat-treated at various temperatures using a low-cost and low-temperature electrochemical deposition technique. The electrochemical behavior of source ions in aqueous solutions is examined by cyclic voltammetry (CV). In the solution at pH 1.5 containing 0.1M Ga(NO 3 ) 3 , 2.5 M NH 4 NO 3 and 0.6 M H 3 BO 3 , reduction of gallium and nitrate ions are observed in CV. The presence of hexagonal GaN and gallium oxide (Ga 2 O 3 ) phases is detected for the films deposited on Al substrates at −3.5 mA•cm -2 for 3 h. The energy dispersive X-ray and mapping results reveal that Ga, O, and N coexist in these films. Raman analysis shows hexagonal GaN formation on Al substrates. The changes in the morphology and preferred orientation of GaN were found, which was caused by the reactivity of aluminum surface and the aluminum oxide layer formed by the heat treatment.

show abstract

A simple synthesis of Ga₂O₃ and GaN nanocrystals

Abstract: A simple top-down strategy to α-Ga2O3 and GaN nanocrystals is developed and the morphology-dependent optical properties of α-Ga2O3 crystals are established.

Cited by 16 publications

References 34 publications

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Chemical Synthesis of β-Ga₂O₃ Microrods on Silicon and Its Dependence on the Gallium Nitrate Concentration

Effect of Heat Treatment of Al Substrate on GaN Film Electrodeposited in Aqueous Solution

Contact Info

Product

Resources

About

A simple synthesis of Ga2O3 and GaN nanocrystals

Abstract: A simple top-down strategy to α-Ga2O3 and GaN nanocrystals is developed and the morphology-dependent optical properties of α-Ga2O3 crystals are established.

Cited by 16 publications

References 34 publications

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Fluorescent Liquid Metal As a Transformable Biomimetic Chameleon

Chemical Synthesis of β-Ga2O3 Microrods on Silicon and Its Dependence on the Gallium Nitrate Concentration

Effect of Heat Treatment of Al Substrate on GaN Film Electrodeposited in Aqueous Solution

Contact Info

Product

Resources

About

A simple synthesis of Ga₂O₃ and GaN nanocrystals

Chemical Synthesis of β-Ga₂O₃ Microrods on Silicon and Its Dependence on the Gallium Nitrate Concentration