Mesoporous gold nanospheres <i>via</i> thiolate–Au(<scp>i</scp>) intermediates

Lv, Hao; Xu, Dongdong; Henzie, Joel; Feng, Ji; Lopes, Aaron; Yamauchi, Yusuke; Liu, Ben

doi:10.1039/c9sc01728c

Cited by 50 publications

(56 citation statements)

References 56 publications

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“…Figure 2(a) shows the XPS energy spectrum identifying Au (84 eV), Si 3 N 4 (398 eV) and SiO 2 (532.9 eV) from the bare gold layer coated MB sensing chip. Figure 2(b) shows the obvious peak at the Au-S bond energy (162.5 eV) 18 compared with the spectrum of the only gold coated surface, confirming that the SAM layer has been successfully immobilized on the gold surface. Since the antibody consists of a peptide bond and a disulfide bond, the energy peaks of amine group (C-NH 2 ) and the disulfide bond (S-S) should be observed in the spectrum.…”

Section: Resultsmentioning

confidence: 79%

A CMOS MEMS-based Membrane-Bridge Nanomechanical Sensor for Small Molecule Detection

Yen

Chiu

2020

Sci Rep

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Small molecule compounds are necessary to detect with high sensitivity since they may cause a strong effect on the human body even in small concentrations. But existing methods used to evaluate small molecules in blood are inconvenient, costly, time-consuming, and do not allow for portable usage. In response to these shortcomings, we introduce a complementary metal-oxide-semiconductor biomicroelectromechanical system (cMoS BioMeMS) based piezoresistive membrane-bridge (MB) sensor for detecting small molecule (phenytoin) concentrations as the demonstration. Phenytoin is one of anticonvulsant drugs licensed for the management of seizures, which has a narrow therapeutic window hence a level of concentration monitoring was needed. The MB sensor was designed to enhance the structural stability and increase the sensitivity, which its signal response increased 2-fold higher than that of the microcantilever-based sensor. The MB sensor was used to detect phenytoin in different concentrations from 5 to 100 μg/mL. The limit of detection of the sensor was 4.06 ± 0.15 μg/mL and the linear detection range was 5-100 μg/mL, which was within the therapeutic range of phenytoin concentration (10-20 μg/mL). Furthermore, the MB sensor was integrated with an on-chip thermal effect eliminating modus and a reaction tank on a compact chip carrier for disposable utilization. The required amount of sample solution was only 10 μL and the response time of the sensor was about 25 minutes. The nano-mechanical MB sensing method with thermal effect compensation is specific, sensitive, robust, affordable and well reproducible; it is, therefore, an appropriate candidate for detecting small molecules.

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Section: Resultsmentioning

confidence: 79%

A CMOS MEMS-based Membrane-Bridge Nanomechanical Sensor for Small Molecule Detection

Yen

Chiu

2020

Sci Rep

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“…They moved quickly in solution and the interaction of them with ILs were weaken. At the same time, the microstructures of ILs in solution became disordered or even be disrupted at high temperature, resulting in the formation of smaller spherical aggregates and dispersed NP mixtures [39,40]. Thus, room temperature (about 25 °C) was suitable for the growth and assembly of the intriguing porous Au worms in the current case.…”

Section: Resultsmentioning

confidence: 85%

Ionic Liquid-Modulated Synthesis of Porous Worm-Like Gold with Strong SERS Response and Superior Catalytic Activities

Yao

Wang

et al. 2019

Nanomaterials

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Porous gold with well-defined shape and size have aroused extensive research enthusiasm due to their prominent properties in various applications. However, it is still a great challenge to explore a simple, green, and low-cost route to fabricate porous gold with a “clean” surface. In this work, porous worm-like Au has been easily synthesized in a one-step procedure from aqueous solution at room temperature under the action of ionic liquid tetrapropylammonium glycine ([N3333][Gly]). It is shown that the as-prepared porous worm-like Au has the length from 0.3 to 0.6 μm and the width of approximately 100–150 nm, and it is composed of lots of small nanoparticles about 6–12 nm in diameter. With rhodamine 6G (R6G) as a probe molecule, porous worm-like Au displays remarkable surface enhanced Raman scattering (SERS) sensitivity (detection limit is lower than 10−13 M), and extremely high reproducibility (average relative standard deviations is less than 2%). At the same time, owing to significantly high specific surface area, various pore sizes and plenty of crystal defects, porous worm-like Au also exhibits excellent catalytic performance in the reduction of nitroaromatics, such as p-nitrophenol and p-nitroaniline, which can be completely converted within only 100 s and 150 s, respectively. It is expected that the as-prepared porous worm-like Au with porous and self-supported structures will also present the encouraging advances in electrocatalysis, sensing, and many others.

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“…Therefore, improving the photostability of UV screening materials is still a challenge. Literatures and our experiments have shown that the un‐assembled Au(I)‐thiolates are easy to transform to gold clusters or gold nanoparticles by chemical reduction, [37–40] thermolysis [41] or photolysis [42] . Here, we studied whether the assembled Au(I)‐thiolate nanosheets can have comparable or superior photostability to the commercial organic UV absorbents.…”

Section: Resultsmentioning

confidence: 99%

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

Zhang

Yang

et al. 2021

ChemNanoMat

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UV screening is very important for the prevention of skin cancer and the elongation of the lifetime of organic/polymeric stuff. To overcome the main problems of poor hydrophilicity and easy leakage of organic UV absorbents, water‐dispersible Au(I)‐thiolate nanosheets have been studied as a new type of UV absorbents. The results show that Au(I)‐thiolate nanosheets have i) very high molar absorption coefficients (>15000 mol/L.cm), ii) comparable or superior photostability to typical organic UV absorbents, and iii) high transparency and nearly no leakage in polymer matrix. So far, no other UV absorbents have been reported to have all the above good performances simultaneously. The transparent and colorless Au(I)‐thiolate/polymer thin films can effectively block UV light, and such a material will surely extend the types and the application scenarios of UV absorbents.

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Mesoporous gold nanospheres via thiolate–Au(i) intermediates

Abstract: This manuscript reports a facile yet effective surfactant-templated synthesis methodology to grow in situ metallic gold mesoporous nanospheres for methanol electrooxidation.

Cited by 50 publications

References 56 publications

A CMOS MEMS-based Membrane-Bridge Nanomechanical Sensor for Small Molecule Detection

A CMOS MEMS-based Membrane-Bridge Nanomechanical Sensor for Small Molecule Detection

Ionic Liquid-Modulated Synthesis of Porous Worm-Like Gold with Strong SERS Response and Superior Catalytic Activities

A Study on Au(I)‐thiolate Nanosheets as Water‐dispersible UV Absorbents

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