One-step synthesis of Zn/ZnO hollow nanoparticles by the laser ablation in liquid technique

Desarkar, H. S.; Kumbhakar, Pathik; Mitra, A. K.

doi:10.1088/1612-2011/10/5/055903

Cited by 40 publications

(43 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Calculated extinction without considering the contribution of the air-Ni NPs is represented by the dashed line in Figure 6. It is readily 36 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 19 deposited. Line 3 in panels (a) and (b) shows the height profile of the mica background across the imaged area.…”

Section: A Ni Colloidal Suspension In N-heptanementioning

confidence: 99%

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

et al. 2015

View full text Add to dashboard Cite

Synthesis of nickel (Ni) nanoparticles (NPs) suspensions was performed using a 120 femtosecond (fs) pulse laser to ablate a Ni solid target in n-heptane and water.Analysis of structure, configuration and sizing was carried out using different independent techniques such as Optical Extinction Spectroscopy (OES), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) and Electron Diffraction (ED), which yield interrelated information.AFM microscopy allows determining the spherical shape and size distribution of the NPs in the obtained colloids while TEM provides knowledge about shape, structure and size distribution. ED allows identification of the different metal and metal oxide composition as well as their crystallographic phase. On the other hand, OES gives information related to size distribution, structure, configuration and composition.Interpretation of these spectra is based on Mie theory which, in turn, depends on Ni dielectric function. For NPs radii smaller than 3 nm, size-dependent free and bound electron contributions to the dielectric function must be considered. To account for the full size span, complete Mie expansion was used for optical extinction cross-section calculations. A theoretical analysis of the dependence of plasmon resonance of bare core and core-shell Ni NPs with core size and shell thickness provide insight about their spectroscopic features.For n-heptane, species like bare core Ni and hollow Ni NPs are found in the colloid, being the latter reported for the first time in this work. Instead, for water, the colloid contains hollow nickel NPs and nickel oxide in different core-shell configurations: Ni-NiO and NiO-Ni, being the latter also reported for the first time in this paper. In both cases, size distribution agrees with that derived from TEM and AFM analysis. The formation of the oxide species is discussed in terms of oxidation-reduction processes during ablation. Possible mechanisms for the formation of hollow species are proposed.

show abstract

Section: A Ni Colloidal Suspension In N-heptanementioning

confidence: 99%

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Various nanostructures of ZnO have been synthesized via solvothermal approaches, 3,6,7,11) CVD, 6,15) microwave irradiation, 19) as well as laser ablation in liquid (LAL) media, 4,5,16,17,[20][21][22][23][24][25][26][27] to name just a few techniques. The latter method, LAL, has recently become a very convenient, simple and versatile approach to prepare diverse nanomaterials at the laboratory scale.…”

mentioning

confidence: 99%

Defects in ZnO nanoparticles laser-ablated in water–ethanol mixtures at different pressures

Gotō

Honda

Kulinich

et al. 2015

Jpn. J. Appl. Phys.

View full text Add to dashboard Cite

The effect of liquid medium and its pressure on the photoluminescence of ZnO nanoparticles prepared via laser ablation of Zn targets in various water-ethanol mixtures is studied. As the ethanol content increases, the photoluminescence of the product changes, while metallic zinc is observed to emerge in nanomaterials prepared in ethanol-rich environments. The applied pressure had a less profound effect, mainly affecting materials produced in water or water-ethanol, and much less those generated in pressurized ethanol. Tuning the reactivity of the liquid and pressurizing it during laser ablation is demonstrated to be promising for tailoring the emission properties of the product.

show abstract

“…Furthermore, since the light-grown NPs evaporate with a characteristic time which depends on their shape, the time spent by an atom in a cluster before resuming its random walk along the pore is in turn affected by the light. Therefore, light drives the overall atomic diffusion-reaction dynamics inside the porous matrix.Unlike the conventional NPs production techniques, relying mainly on chemical [17] and photochemical approaches [9] or laser ablation in liquids [18,19], the method presented here is based on the reversible light-induced modifications of the atomic adsorption/desorption and cluster nucleation rates. This approach allows for the observation and control of the dynamics of the NPs' formation/evaporation processes.…”

mentioning

confidence: 99%

Laser-driven self-assembly of shape-controlled potassium nanoparticles in porous glass

et al. 2014

View full text Add to dashboard Cite

Abstract. We observe growth of shape-controlled potassium nanoparticles inside a random network of glass nanopores, exposed to low-power laser radiation. Visible laser light plays a dual role: it increases the desorption probability of potassium atoms from the inner glass walls and induces the self-assembly of metastable metallic nanoparticles along the nanopores. By probing the sample transparency and the atomic light-induced desorption flux into the vapour phase, the dynamics of both cluster formation/evaporation and atomic photo-desorption processes are characterized. Results indicate that laser light not only increases the number of nanoparticles embedded in the glass matrix but also influences their structural properties. By properly choosing the laser frequency and the illumination time, we demonstrate that it is possible to tailor the nanoparticles' shape distribution. Furthermore, a deep connection between the macroscopic behaviour of atomic desorption and light-assisted cluster formation is observed. Our results suggest new perspectives for the study of atom/surface interaction as well as an effective tool for the light-controlled reversible growth of nanostructures.PACS numbers: 78.67. Bf, 36.40.Mr, 78.67.Rb Keywords: laser-control of atomic transport, nanoparticles self-assembly, nanoporous materials. Laser driven self-assembly of shape-controlled potassium nanoparticles in porous glass2Atomic adsorption and desorption have a major influence on surface processes and related transport phenomena [1,2,3]. Their control provides a tool for driving the evolution of nanoscale systems, where the atomic mobility is strongly affected by the interaction with the substrate [4,2,5]. The atomic transport in adsorbing porous materials is governed by the adsoprtion/desorption events at the pore's surface, where atomic nanoaggregates are assembled as a consequence of atomic surface diffusion and nucleation [2,6,7,8]. Many experiments involving different adsorbates and substrates demonstrated that light can influence the formation of nanostructures [9,10,11,12,13,14].In particular, in porous materials loaded with alkali-metal atoms, it has been proved that atomic photo-desorption [15] plays a key role in cluster growth [6,16]. Upon visible illumination, the atomic desorption probability from atomic layers covering the pore's surface increases; consequently also the atomic diffusion coefficient, which is proportional to the desorbing rate, rises. The atomic motion can be thus modelled as a random sequence of free flights between the pore walls, interrupted by adsorption events at the nanopore surface [2]. As an atom sticks to the surface, it can be either desorbed again -with a light-enhanced probability -or can be trapped at surface defects where metastable metallic nanoparticles (NPs), characterized by defined surface plasmon bands, are formed [6,7].In this work, we use low-power visible laser irradiation to induce atomic desorption and, thus, the formation of K NPs inside a nanoporous glass matrix. Our results in...

show abstract

One-step synthesis of Zn/ZnO hollow nanoparticles by the laser ablation in liquid technique

Cited by 40 publications

References 35 publications

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

Synthesis of Ni Nanoparticles by Femtosecond Laser Ablation in Liquids: Structure and Sizing

Defects in ZnO nanoparticles laser-ablated in water–ethanol mixtures at different pressures

Laser-driven self-assembly of shape-controlled potassium nanoparticles in porous glass

Contact Info

Product

Resources

About