Modifying the Size and Shape of Monodisperse Bifunctional Alkaline-Earth Fluoride Nanocrystals through Lanthanide Doping

Chen, Daqin; Yu, Yunlong; Huang, Feng; Huang, Ping; Yang, Anping; Wang, Yuansheng

doi:10.1021/ja1036429

Cited by 292 publications

(200 citation statements)

References 36 publications

Supporting

Mentioning

192

Contrasting

Unclassified

Order By: Relevance

“…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

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

show abstract

“…14 Wang et al 15 demonstrated that addition of Gd 3+ could control the size, phase, and upconversion emission of NaYF 4 . Similarly, Chen et al 16 reported that lanthanide doping of an alkaline-earth metal fluoride resulted in significantly improved monodispersity. A common strategy for enhancing the luminescence is to tune the doping concentration of lanthanide ions, 17,18 but high doping level may lead to concentration quenching, particularly in the short-wavelength spectral region, which may deteriorate the luminescence intensity.…”

Section: Introductionmentioning

confidence: 93%

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

Ding

Wang

Zhang

et al. 2017

Journal of Elec Materi

View full text Add to dashboard Cite

The concentration of La 3+ in (La x Gd 1Àx ) 2 O 2 S:Tb phosphors prepared by the sulfide fusion method from coprecipitated oxalate precursors has been tuned, and the prominent effect on the crystalline size, particle size, and luminescence properties investigated. First-principles calculations were used to characterize the charge deformation, energy gap, and crystal field. According to density functional theory, the electron density of states in conduction bands increased with increase in the La 3+ concentration. The increased electronic density strengthened the repulsion and thus decreased the diffusion so as to decrease the crystalline size from 106.2 nm to 37.3 nm. The particle size of (La x Gd 1Àx ) 2 O 2 S:Tb increased from 0.21 lm to 1.25 lm as the La 3+ concentration was increased from 15 mol.% to 60 mol.%. The excitation spectrum shifted towards shorter wavelength, enhancing the luminescence intensity of (La x Gd 1Àx ) 2 O 2 S:Tb when excited at 254 nm. Furthermore, shorter lifetime was obtained due to lower symmetry as more Gd 3+ was substituted by La 3+ ions.

show abstract

“…Among the established approaches, thermal decomposition [43][44][45][46], high-temperature coprecipitation [47][48][49] and hydro (solvo) thermal methods [50][51][52] are the most popular synthetic routes. These methods commonly make use of the organic surfactants to control the nucleation and growth of the nanocrystals.…”

Section: Controlled Synthesismentioning

confidence: 99%

Inorganic lanthanide nanoprobes for background-free luminescent bioassays

Huang

Zheng

et al. 2015

Sci. China Mater.

Self Cite

View full text Add to dashboard Cite

Luminescent bioassay techniques have been widely adopted in a variety of research and medical institutions. However, conventional luminescent bioassays utilizing traditional bioprobes like organic dyes and quantum dots often suffer from the interference of background noise from scattered lights and autofluorescence from biological matrices. To eliminate this disadvantage, the use of inorganic lanthanide (Ln 3+ )-doped nanoparticles (NPs) is an excellent option in view of their superior optical properties, such as the long-lived downshifting luminescence, near-infrared triggered anti-Stokes upconverting luminescence and excitation-free persistent luminescence. In this review, we summarize the latest advances in the development of inorganic Ln 3+ -doped NPs as sensitive luminescent bioprobes from their fundamental physicochemical properties to biodetection, including the chemical synthesis, surface functionalization, optical properties and their promising applications for background-free luminescent bioassays. Future efforts and prospects towards this rapidly growing field are also proposed. INTRODUCTIONSensitive and specific bioassay of trace amount of target analytes is essential for a variety of biomedical applications ranging from pharmaceutical preparation to disease diagnosis and therapy [1][2][3]. Among various bioassay methods, luminescent bioassay has received particular attention because of its high sensitivity and good specificity [4,5]. Conventional luminescent bioassay techniques such as enzyme-linked immunosorbent assay (ELISA), time-resolved (TR) fluoroimmunoassay (TRFIA), Förster resonance energy transfer (FRET) and TR-FRET assays have laid the foundation for many modern clinical applications [6][7][8][9][10][11]. However, these bioassays are impeded by the availability of traditional bioprobes like organic dyes, lanthanide (Ln 3+ ) chelates and quantum dots (QDs). The use of these bioprobes has a number of limitations. Organic dyes commonly possess poor photochemical stability and suffer from serious photobleaching [12]. The applicability of QDs is compromised by photoblinking and high toxic- ity of heavy metal elements like cadmium and selenium, especially for in vivo biosensing [13,14]. Moreover, both organic dyes and QDs may induce high background noise and considerable photodamage to the biological samples under ultraviolet (UV) excitation, which deteriorates their detection sensitivity for bioassays [15,16]. Although such background noise can be suppressed by the technique of TR photoluminescence (PL) through the use of the longlived luminescence of Ln 3+ -chelates, the poor photochemical stability, long-term toxicity and high cost of Ln 3+ -chelates remain a major issue [17]. These concerns fuel a crucial demand for the development of a new generation of luminescent bioprobes to circumvent the limitations of traditional ones.Recently, with the explosion of nanoscience and nanotechnology, there is a growing dedication towards the development of diverse luminescent nanoprobes for biodetection ...

show abstract

Modifying the Size and Shape of Monodisperse Bifunctional Alkaline-Earth Fluoride Nanocrystals through Lanthanide Doping

Cited by 292 publications

References 36 publications

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

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

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

Inorganic lanthanide nanoprobes for background-free luminescent bioassays

Contact Info

Product

Resources

About