ZnO Nanocomposites Modified by Hydrophobic and Hydrophilic Silanes with Dramatically Enhanced Tunable Fluorescence and Aqueous Ultrastability toward Biological Imaging Applications

Li, Shuying; Sun, Zongzhao; Li, Rui; Dong, Minmin; Zhang, Liyan; Qi, Wei; Zhang, Xuelin; Wang, Hua

doi:10.1038/srep08475

Cited by 50 publications

(53 citation statements)

References 33 publications

(53 reference statements)

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“…S4). Herein, the enhancement of the probe fluorescence intensities was thought to benefit from the electronic donor effects38, in which the amine groups of APS with protonic nitrogen atoms might serve as the electron donors for the fluorescent Au-AgNCs on test strips. However, higher APS percentages, i.e., 40% and 80%, were not attempted, since they could decrease the fluorescence intensities of the probes presumably resulting from the increasing aggregations of APS hydrolysis products.…”

Section: Resultsmentioning

confidence: 99%

“…Hegseth and co-workers established that under the fast evaporation condition the interior Marangoni flow of the droplets could be boosted so as to suppress the “coffee ring” effect36. Our group have also proposed the construction of hydrophobic surfaces to reverse the “coffee stains” to achieve the highly uniform and dense testing dots on the microarrays for the biomedical detections3738. Moreover, up to date, a few investigations have been conducted on how to suppress the “coffee stains” on the porous substrates of test strips2829, although this phenomenon has been generally ignored for the strips-based microfluidic and diagnostic analysis devices8394041424344.…”

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confidence: 99%

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Fluorimetric Mercury Test Strips with Suppressed “Coffee Stains” by a Bio-inspired Fabrication Strategy

Qiao

Shang

et al. 2016

Sci Rep

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A fluorimetric Hg2+ test strip has been developed using a lotus-inspired fabrication method for suppressing the “coffee stains” toward the uniform distribution of probe materials through creating a hydrophobic drying pattern for fast solvent evaporation. The test strips were first loaded with the model probes of fluorescent gold-silver nanoclusters and then dried in vacuum on the hydrophobic pattern. On the one hand, here, the hydrophobic constraining forces from the lotus surface-like pattern could control the exterior transport of dispersed nanoclusters on strips leading to the minimized “coffee stains”. On the other hand, the vacuum-aided fast solvent evaporation could boost the interior Marangoni flow of probe materials on strips to expect the further improved probe distribution on strips. High aqueous stability and enhanced fluorescence of probes on test strips were realized by the hydrophilic treatment with amine-derivatized silicane. A test strips-based fluorimetry has thereby been developed for probing Hg2+ ions in wastewater, showing the detection performances comparable to the classic instrumental analysis ones. Such a facile and efficient fabrication route for the bio-inspired suppression of “coffee stains” on test strips may expand the scope of applications of test strips-based “point-of-care” analysis methods or detection devices in the biomedical and environmental fields.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Fluorimetric Mercury Test Strips with Suppressed “Coffee Stains” by a Bio-inspired Fabrication Strategy

Qiao

Shang

et al. 2016

Sci Rep

Self Cite

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“…Within this regard, several works demonstrated the potentialities of silane functionalization. For example, ZnO quantum dots (QDs) were successfully functionalized with hydrophobic hexadecyltrimethoxysilane (HDS) and then hydrophilic aminopropyltriethoxysilane (APTES) bilayers . In contrast to what mentioned above, the functionalized ZnO QDs showed high stability in aqueous media and furthermore tunable photoluminescence properties from blue to green/yellow.…”

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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“…ZnO is widely used as an effective photoluminescence material, especially due to its low toxicity [15]. However, colloidal ZnO-QDs prepared by common sol-gel route are unstable in aqueous solution and tend to aggregate, thus losing their luminescent properties [16]. For this reason, many surface modification strategies have been studied in order to improve the stability of ZnO NPs [17].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, recent research activities have been focused on organosilanes as modifier and surface passivation for the stabilisation of ZnO QDs in water. The strong affinity of organosilanes towards the hydroxylated ZnO surface leads to the formation of covalent Si-O-Zn bond, thus creating a shielding barrier of siloxane around the ZnO core [16,[20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Surface modification of ZnO quantum dots by organosilanes and oleic acid with enhanced luminescence for potential biological application

Rissi

Hammer

Chiavacci

2017

Mater. Res. Express

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ZnO Nanocomposites Modified by Hydrophobic and Hydrophilic Silanes with Dramatically Enhanced Tunable Fluorescence and Aqueous Ultrastability toward Biological Imaging Applications

Cited by 50 publications

References 33 publications

Fluorimetric Mercury Test Strips with Suppressed “Coffee Stains” by a Bio-inspired Fabrication Strategy

Fluorimetric Mercury Test Strips with Suppressed “Coffee Stains” by a Bio-inspired Fabrication Strategy

Surface Engineering of Nanostructured ZnO Surfaces

Surface modification of ZnO quantum dots by organosilanes and oleic acid with enhanced luminescence for potential biological application

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