Size control of nanoparticles by multiple-pulse laser ablation

Yu, Jiaxin; Nan, Junyi; Zeng, Heping

doi:10.1016/j.apsusc.2017.01.094

Cited by 32 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[4] Physical methods of deposition of nanostructured catalysts on the base of laser ablation allow to overcome these difficulties and synthesise bimetallic catalysts in one stage under environmentally friendly and reproducible conditions. [5][6][7][8] Among ablation techniques the laser electrodispersion (LED) stands out for its ability to produce monodispersed metal drops in the laser plasma torch. Their deposition on the support surface makes it possible to produce "core-shell" size-selected catalysts in one stage without auxiliary chemical reagents, reduction agents and stabilizers, with these catalysts being unusually stable against aggregation and sintering.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

View full text Add to dashboard Cite

One‐stage size‐selective method of laser electrodispersion (LED) was used to produce nanostructured NiPd, NiMo and NiW coatings on the surface of alumina, HOPG and Sibunit for the catalytic application. The deposition of nanoparticles produced by LED of bimetallic targets from alloyed or pressed metal powders provides the uniform distribution of both metals on the outer support surface; the metal ratio is similar to that in the original target. The catalytic behaviour of produced “core‐shell” catalysts in comparison with monometallic analogues was tested in two model reactions: the CO oxidation with oxygen on NiPd catalysts supported on alumina and Sibunit; and thiophene oxidation with hydrogen peroxide on NiMo and NiW alumina supported catalysts. Novel LED bimetallic catalysts with extremely low metal content (0.005 %) were superior in terms of activity and stability to monometallic ones and the catalysts obtained by “wet” chemistry methods. Improved catalytic properties of bimetallic LED catalysts are related to the high density of single nanoparticles and the formation of active metal‐oxide interfaces on the support surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Studies have proven that short laser pulses result in a high atomization and ionization which can be attributed to high pulse intensity (Shirk & Molian, ). The high pulse intensity, along with alteration of wavelength that can be absorbed by a previously formed nanoparticle results in the reduction of average size and a wider distribution (Yu, Nan, & Zeng, ). TEM (transmission electron microscopy) analysis (Figure b,c) showed that the mean particle size of individual Cytosensor increases with increasing laser pulse energy.…”

Section: Resultsmentioning

confidence: 99%

Quantum cytosensor for early detection of cancer

2020

View full text Add to dashboard Cite

Current use of graphene quantum dot for cancer detection is highly impeded by the low Raman cross‐section and used as a carrier for plasmonic materials. Hence, there is a need for a sensor an efficient Raman cross‐section, with maintaining the cellular homeostasis to attain accurate detection. Here, we report a SERS‐activated graphene oxide (GO) quantum Cytosensor for whole cell cancer detection capable for the early detection of cancer down to a single cellular level. On approaching quantum scale, we achieved SERS activation of GO quantum dots by introducing the functionality of quantum confinement. By altering the density of functional groups on the surface, we facilitated accelerated self‐cellular uptake resulting in increased SERS sensitivity. Here, we demonstrate cancer detection by two approaches: biomarker detection in external environment and intracellular detection using three cell lines. The quantum Cytosensor advances cancer detection to the molecular level by sensing the complex biomolecular processes transpiring intracellularly to detect and differentiate cancerous attributes of a cell. We observed a 3000‐, 2500‐ and 3500‐fold increase in enhancement of DNA, RNA and protein, respectively. Discernment of SERS spectral signatures was obtained by employing machine learning techniques which primarily identified the differences between cancer cells and normal cells. The classification and clustering techniques provided a high diagnostic sensitivity and specificity of 84.83% with unparalleled accuracy of 92.3%. Detection of cancer down to a single cellular level using quantum Cytosensor via SERS integrated with machine learning provides a new stepping stone towards adoption of SERS‐based early detection of cancer.

show abstract

“…Moreover, when bulk Cu is transformed to CuNPs, the physicochemical and biological properties of Cu can be improved (e.g., the catalytic, optical, electrical, and more importantly the antimicrobial capability) [9]. Several strategies have been explored in order to synthesize CuNPs, for example, laser ablation, thermal modifications, vacuum vapor deposition, and chemical reduction [10][11][12]. Interestingly, chemical reduction offers a versatile and easy way to synthesize reproducible, stable, and controllable CuNPs, by the reduction and stabilization of Cu +2 ions to Cu 0 by capping with organic compounds (if the synthesis is carried out under reflux conditions) [13,14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and In Situ Antifungal and Cytotoxicity Evaluation of Ascorbic Acid-Capped Copper Nanoparticles

Beltrán-Partida

Valdez‐Salas

Valdez-Salas

et al. 2019

Journal of Nanomaterials

View full text Add to dashboard Cite

The design route, synthesis, and characterization of spherical copper nanoparticles with antifungal potential are reported in the present work. Copper nanoparticles were synthesized by a novel, inexpensive, and eco-friendly chemical reduction method using ascorbic acid as a reductant and stabilizer under reflux conditions. The characterization results showed the formation of homogeneous, dispersed, and stable spherical ascorbic acid-capped copper nanoparticles (CuNPs) with a diameter of 250 nm. The CuNPs exhibited sustained antifungal activity against Candida albicans (C. albicans) after 24 h and even 48 h of incubation. Using enhanced dark-field microscopy, we presented the in situ interaction between CuNPs and C. albicans. Here, part of the interaction of CuNPs among the C. albicans, studied without the use of any chemical and/or physical fixing method, is discussed. The results indicate that part of the antifungal mechanism involves a promoted adhesion of CuNPs onto the cell wall and a massive accumulation of CuNPs into the fungal cells, concluding in cellular leakage. The cytotoxicity (viability) evaluations indicated that our CuNPs were more biocompatible after comparison to the Cu precursor and triclosan (a commercial antifungal drug). The synthesized CuNPs will open up a new road for their possible use as a potent antimicrobial agent for clinical and industrial applications.

show abstract

Size control of nanoparticles by multiple-pulse laser ablation

Cited by 32 publications

References 28 publications

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Bimetallic Nanostructured Catalysts Prepared by Laser Electrodispersion: Structure and Activity in Redox Reactions

Quantum cytosensor for early detection of cancer

Synthesis, Characterization, and In Situ Antifungal and Cytotoxicity Evaluation of Ascorbic Acid-Capped Copper Nanoparticles

Contact Info

Product

Resources

About