Morphology Control by Pulsed Laser in Chemical Deposition Illustrated in ZnO Crystal Growth

Liu, Siyu; Liu, C. Richard

doi:10.1021/acs.cgd.9b00133

Cited by 16 publications

(20 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The addition of acidic polymers could offer the control on crystal growth; for nucleation control, previous methods to control nucleation include usual cooling, evaporate crystallization, ultrasound, , and the application of electric field and magnetic field. − One particular nucleation method called laser-induced nucleation (LIN) is the most documented technique, which could highly control nucleation sites by precisely adjusting the pulsed laser energy; morphological control could be obtained by LIN through adjusting the laser power density to selectively overcome the energy barriers of different surfaces of crystals. These benefits are observed in the work of ZnO morphology control by adjusting the pulsed laser energy to differentiate the growth rate on a Si(100) surface, as reported by S. Liu and C. R. Liu . With respect to the continuous-wave laser light, the polymorph of a glycine crystal could be selectively controlled by tuning laser polarization and power, according the account of Sugiyama and their co-workers .…”

Section: Introductionmentioning

confidence: 84%

“…These benefits are observed in the work of ZnO morphology control by adjusting the pulsed laser energy to differentiate the growth rate on a Si(100) surface, as reported by S. Liu and C. R. Liu. 30 With respect to the continuous-wave laser light, the polymorph of a glycine crystal could be selectively controlled by tuning laser polarization and power, according the account of Sugiyama and their coworkers. 31 More recently, Cheng et al applied optical trapping with a focused continuous-wave near-infrared laser to demonstrate the morphology evolution of KCl crystals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Acidic Polymers on the Morphology of Laser-Induced Nucleation of Cesium Chloride

et al. 2021

View full text Add to dashboard Cite

An approach to controlling morphology and size is presented through the combination of laser-induced nucleation and polymer additives. Here, we apply the technique of non-photochemical laser-induced nucleation to irradiate a supersaturated solution (S = 1.15) of cesium chloride (CsCl). The solution immediately responds to laser exposure, and spherical crystallites are produced along the laser pathway. The crystals gradually grow into snowflake-like crystals with different sizes. In this report, two types of acidic polymers including polyepoxysuccinic acid (PESA) and polyaspartic acid (PASA) were individually added in supersaturated CsCl solution to shape its crystalline morphology; we found that a particular property of this control from PESA is uniformity in modification of crystal sizes. Additionally, we observed that both PESA and PASA were able to decrease crystal growth velocity and the quantity of crystals after laser irradiation. With the effect of more than 0.2 wt % PESA in solution, spherical crystallites were initially induced by laser; after that, crystal growth velocities and sizes became slower and smaller with increase in mass fraction of PESA, which led to identical crystal sizes. With the effect of more than 5 wt % PESA, the resulting crystalline morphology obtained by laser was flower-like crystals, whilst cuboid-shaped crystals could be obtained by spontaneous nucleation. Classical nucleation theory, crystal growth rate, and additives as large-size impurities were discussed to analyze the underlying mechanism of the change in morphology.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Effect of Acidic Polymers on the Morphology of Laser-Induced Nucleation of Cesium Chloride

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Interesting reaction pathways were proposed by Liu and Liu by employing the pulsed-laser deposition technique to obtain a given morphology of ZnO [ 81 ]. The authors demonstrated that laser-induced crystal growth is a practical tool to tune the morphology of nanomaterials in a precise and effective manner.…”

Section: Resultsmentioning

confidence: 99%

Back to the Basics: Probing the Role of Surfaces in the Experimentally Observed Morphological Evolution of ZnO

et al. 2023

View full text Add to dashboard Cite

Although the physics and chemistry of materials are driven by exposed surfaces in the morphology, they are fleeting, making them inherently challenging to study experimentally. The rational design of their morphology and delivery in a synthesis process remains complex because of the numerous kinetic parameters that involve the effective shocks of atoms or clusters, which end up leading to the formation of different morphologies. Herein, we combined functional density theory calculations of the surface energies of ZnO and the Wulff construction to develop a simple computational model capable of predicting its available morphologies in an attempt to guide the search for images obtained by field-emission scanning electron microscopy (FE-SEM). The figures in this morphology map agree with the experimental FE-SEM images. The mechanism of this computational model is as follows: when the model is used, a reaction pathway is designed to find a given morphology and the ideal step height in the whole morphology map in the practical experiment. This concept article provides a practical tool to understand, at the atomic level, the routes for the morphological evolution observed in experiments as well as their correlation with changes in the properties of materials based solely on theoretical calculations. The findings presented herein not only explain the occurrence of changes during the synthesis (with targeted reaction characteristics that underpin an essential structure–function relationship) but also offer deep insights into how to enhance the efficiency of other metal-oxide-based materials via matching.

show abstract

“…ZnO crystals or intermediate species in this study were produced by the pulsed laser method, similar to the previous studies. 13 The precursor solution for producing ZnO crystals was prepared from zinc acetate dihydrate in alcoholic solution under basic conditions. 15 stirring at room temperature.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…Zinc oxide (ZnO) is one of the most common oxides that could be easily produced by hydrothermal reaction. In this work, ZnO as a vehicle for the study of crystallization was produced by the pulsed laser method. − The pulsed laser as a new tool to study the crystallization , could “freeze” the crystallization process in a stepwise manner. For example, the nucleation could be initiated by a single laser pulse, and the following aging processes, such as recrystallization or dissolution–reprecipitation, could be inhibited after the single pulse .…”

Section: Introductionmentioning

confidence: 99%

Observation of New Dynamics of Transitions among Intermediate Species in Crystal Evolution and Its Role in a Generic Model of Crystallization

Liu

2021

J. Phys. Chem. C

Self Cite

View full text Add to dashboard Cite

The mass and phase transitions among intermediate species are unique dynamics in nonclassical crystallization that are under investigation. In this research, we used a pulsed laser to initiate crystallization in its early stages and observed the crystal evolution through transitions and interactions among the intermediate species. The crystal evolution was induced and observed in situ simultaneously by the same electron beam in a transmission electron microscope without a liquid cell environment, thereby eliminating the complexity introduced by the additional nucleation in the precursor solution. The observed mass diffusion among species in an anti-Ostwald ripening way indicated that crystallization systems were composed of intermediate species in various phases. We found that these intermediate species were not like rigid building blocks but kept changing in size and phase and evolving in multistage transitions. Considering the observations, we propose a generic model by extending the classical nucleation theories to describe the dynamics of intermediate transitions and all possible crystal evolution pathways, discovered or not.

show abstract

Morphology Control by Pulsed Laser in Chemical Deposition Illustrated in ZnO Crystal Growth

Cited by 16 publications

References 38 publications

Effect of Acidic Polymers on the Morphology of Laser-Induced Nucleation of Cesium Chloride

Effect of Acidic Polymers on the Morphology of Laser-Induced Nucleation of Cesium Chloride

Back to the Basics: Probing the Role of Surfaces in the Experimentally Observed Morphological Evolution of ZnO

Observation of New Dynamics of Transitions among Intermediate Species in Crystal Evolution and Its Role in a Generic Model of Crystallization

Contact Info

Product

Resources

About