Size-dependent photoluminescence of zinc oxide quantum dots through organosilane functionalization

Muşat, Viorica; Tăbăcaru, Aurel; Vasile, Bogdan Ştefan; Surdu, Vasile–Adrian

doi:10.1039/c4ra10851e

Cited by 39 publications

(22 citation statements)

References 44 publications

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“…The rocking vibration of this latter bonding is located at 864 cm −1 . By FTIR, ZnO is mainly identified by the presence of bands located at 546, 1418, and 1555 cm −1 assigned to Zn‐O stretching vibrations, symmetric and asymmetric stretching of carboxylate group ‐COO‐ of residual acetate anions chemically attached to ZnO surface, respectively . The wide O‐H stretching band is located at 3360 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Thermosetting polymers in cold sintering: The fabrication of ZnO‐polydimethylsiloxane composites

et al. 2020

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This study reports the fabrication of the first ceramics‐thermosetting polymer composites by the cold sintering process, for high ceramic volume fractions (v/v >95%). The (1 − x) ZnO − x polydimethylsiloxane (PDMS) composites, with 0.00 ≤ x ≤ 0.05, were cold sintered at 250°C, 320 MPa for 60 minutes. In situ densification studies conducted with the help of a semi‐automated press revealed that the mechanisms driving the densification of the material changes with the polymer content. Relative densities of the (1 − x) ZnO − x PDMS composites (0.00 ≤ x ≤ 0.05) were above 90%. Impedance spectroscopy of the composites yields insight into the ceramic‐polymer interfaces within the sintered ZnO bulk and suggests long‐range conduction governed by ZnO‐PDMS interface properties for x = 0.03 and x = 0.05. The study also emphasizes on the complexities and opportunities of such ceramic‐dominated ceramic‐polymer composites.

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Section: Resultsmentioning

confidence: 99%

Thermosetting polymers in cold sintering: The fabrication of ZnO‐polydimethylsiloxane composites

et al. 2020

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“…Another useful application of silane groups is their use as surfactants to control the stability of ZnO nanoparticle colloidal suspensions. Muşat et al exploited this aspect by the organosilane grafting on the surface of ZnO NPs, using different amounts of the surfactant 3‐(trimethoxysilyl)propylmethacrylate (MPS) (2, 5 and 10% molar ratios of Si/Zn) . The organosilane surfactant was properly chosen to evaluate its ability to both prevent the agglomeration of the NPs and to tune the optical properties of the resulting hybrid nanomaterials.…”

Section: Covalent Bonding Of Chemical Groups On Nanostructured Zno Sumentioning

confidence: 99%

Surface Engineering of Nanostructured ZnO Surfaces

Laurenti

Stassi

Canavese

et al. 2016

Adv Materials Inter

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are oriented in one direction and their assembly and stacking produces the wurtzite hexagonal symmetry. The noncentrosymmetric and anisotropic crystalline structure of wurtzite-like ZnO generates very interesting properties such as piezo-and pyro-electricity: the application of an external stimulus, like mechanical stress or temperature, deforms the tetrahedron structure. This deformation results in a separation between the positive and negative centers of charge, inducing the formation of a dipole moment. [7,8] The polar surface and anisotropic structure of ZnO can be usefully exploited to form different kinds of micro and nanostructures from 0D to 3D, [5] including, but not limited to nanowires, [9][10][11][12] nanotubes, [13,14] nanobelts, [15][16][17][18][19] nanorings, [20] flower-like morphologies, [21][22][23][24][25] multipods, [26,27] tetrapods, [28][29][30] sponge-like structures [31][32][33][34] and so on [29,[35][36][37][38][39] (Figure 1). Therefore, several research efforts have been invested in studying various preparation procedures for ZnO micro and nano-materials. Wet chemical approaches, like sol-gel, hydrothermal growths, electrodeposition and template-assisted routes, [40,41] as well as vapor-phase methods, for example chemical vapour deposition (CVD), physical vapour deposition (PVD) including sputtering and evaporation approaches, [42][43][44] and epitaxial growth methods [45] are among the most used ones. The great advantages of the wet chemical approaches are the high synthesis versatility, low temperature employed and low costs. [9] From the other side, dry methods take advantage of the high quality and excellent control over the level of crystallinity of the synthesized ZnO structures, as well as the absence of contamination and high purity of the final material. [46] The combination of different properties with the ease and high versatile synthesis of ZnO material in different micro and nanostructures offers a huge possibility of potential applications.For example, ZnO is already used as an efficient catalyst in the selective oxidation of involving oxygenates (i.e., alcohols, aldehydes, and carboxylic acids) and in methanol synthesis catalysts. It is also largely applied as protective, anti-corrosion layer in galvanized steel products, [49][50][51] as well as in paints and sunscreens as an UV absorber. Its biocompatibility makes this material suitable, in the form of microparticles, for paste formulations in cosmetic applications.The combination of the piezoelectric with the semiconducting properties of ZnO is found to result into new exciting physical properties, [52][53][54] and it has recently opened the research field to energy harvesting application. ZnO nanomaterials can be thus used as nanogenerators, able to convert the mechanical deformation from the surrounding environment into electrical Zinc Oxide (ZnO) nanostructures represent promising substrate materials for numerous applications, ranging from new generation solar cells, to bio-and chemical sensors. This interest is due ...

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“…The organosilane-modified ZnO NPs were prepared according to the precipitation method reported in the literature [27]. The obtained samples are hereafter labeled with ZnO for the unmodified nanoparticles, and ZnO-MPS-x% for ZnO NPs modified with 2, 5 and 10% MPS, respectively.…”

Section: Synthesis Of Organosilane-modified Zno Npsmentioning

confidence: 99%

“…In our recent investigations, ZnO NPs were modified with organosilane surfactants such as 3-(trimethoxysilyl)propylmethacrylate (MPS) [27] and vinyltrimethoxysilane (VTMS) [28], or with a diquaternary salt of bis(pyridinium) such as N,N'-di(p-methoxyphenacyl)-1,2-bis(4-pyridinium)ethane (DSB) [29], and the influence of particles size on the optical properties was studied. In the present contribution, we sought to study the photocatalytic activity, though very less explored, of organomodified ZnO NPs.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic study of organosilane-modified zinc oxide nanoparticles

Tăbăcaru

Bușilă

Plescan

et al. 2015

Ovidius University Annals of Chemistry

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In our recent studies, we have investigated the tunability of optical properties of zinc oxide nanoparticles (ZnO NPs) through surface modification with organosilane surfactants. In the present paper, the effect of ZnO NPs modified with variable amount of 3-(trimethoxysilyl)propylmethacrylate (MPS) surfactant was investigated toward the photocatalytic degradation of methylene blue (MB), using two different UV light sources emitting at 254 nm and 365 nm. While the maximum photodegradation efficiency of 63% was reached by ZnO NPs loaded with the highest concentration of MPS upon exposure at 254 nm, in the case of UV exposure at 365 nm an opposite photodegradation trend was observed. Actually, a significant photodegradation efficiency of 95% was recorded by the unmodified ZnO, followed by ZnO NPs modified with 2% MPS for which the photodegradation efficiency amounted to 80%, thus highlighting their best photocatalytic performance.

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Size-dependent photoluminescence of zinc oxide quantum dots through organosilane functionalization

Abstract: Zinc oxide quantum dots show increasing emission intensities and decreasing band gaps upon size reduction promoted by organosilane functionalization.

Cited by 39 publications

References 44 publications

Thermosetting polymers in cold sintering: The fabrication of ZnO‐polydimethylsiloxane composites

Thermosetting polymers in cold sintering: The fabrication of ZnO‐polydimethylsiloxane composites

Surface Engineering of Nanostructured ZnO Surfaces

Photocatalytic study of organosilane-modified zinc oxide nanoparticles

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