Photochemical strategies for the green synthesis of ultrathin Au nanosheets using photoinduced free radical generation and their catalytic properties

He, Suisui; Hai, Jun; Li, Tianrong; Li, Sha; Chen, Fengjuan; Wang, Baodui

doi:10.1039/c8nr04942d

Cited by 15 publications

(10 citation statements)

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“…These are based on the difference in the growth rates between a certain dimension and the other dimensions. The excessive increase of the reaction rates often reduces the particles’ shape anisotropy in the nanosheet synthesis due to the three-dimensional precursor supply, as shown in Figure a. ,,, …”

Section: Introductionmentioning

confidence: 99%

“…The excessive increase of the reaction rates often reduces the particles' shape anisotropy in the nanosheet synthesis due to the three-dimensional precursor supply, as shown in Figure 1a. 8,9,15,16 Bilayers in hyperswollen lyotropic lamellar (HL) phases of dilute aqueous amphiphile solutions confine hydrophobic molecules in a several nanometer-thick 2-D space, and they maintain several hundred nanometer intervals between two adjacent bilayers. 17 The confined hydrophobic molecules react to give hydrophobic nanosheets; 18 this synthesis method is named "two-dimensional reactor in amphiphilic phases (TRAP) method."…”

Section: ■ Introductionmentioning

confidence: 99%

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Lateral Growth of Uniformly Thin Gold Nanosheets Facilitated by Two-Dimensional Precursor Supply

et al. 2021

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The nanosheets of highly symmetric materials with a facecentered cubic lattice such as gold have been synthesized by adsorbing the precursors on a flat surface, whose chemical specificity induces the anisotropy of growth rates. We have succeeded in the fabrication of gold nanosheets in a hydrophilic space inside highly separated bilayers, which work as two-dimensional hydrophilic reactors, in a hyperswollen lamellar liquid crystalline phase of an amphiphile solution. One of the physical properties, amphiphilicity, confines the ingredients therein. The nanosheets can only grow in the in-plane direction due to the inhibition of the out-of-plane growth rather than the anisotropy of growth rates probably. Thus, the synthesis can be accelerated; the particles can be completed within 15 min. As not relying on chemical specificity, silver nanosheets could also be synthesized in the same way. The suspension of gold and silver nanosheets without any amphiphiles could be obtained, and the solvent is replaceable. We found that the width of the obtained gold nanosheets is proportional to the Reynolds number of the solution because the area of the bilayer in the hyperswollen lamellar phase depends on shear stress. This implies that the areas of gold nanosheets depend on the areas of the bilayers, and it can be controlled by changing the Reynolds number. This method could be widely used to continuously obtain large-area nanosheets of various materials in a roll-to-roll manufacturing process.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Lateral Growth of Uniformly Thin Gold Nanosheets Facilitated by Two-Dimensional Precursor Supply

et al. 2021

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“…1–3 The ultrathin AuNSs offer a high surface-to-volume ratio, optical transparency, and good electrical conductivity for their efficient application in catalysis and flexible electronic devices. 4–7…”

Section: Introductionmentioning

confidence: 99%

Encapsulation of atomically thin gold nanosheets within porous silica for enhanced structural stability and superior catalytic performance

Balakrishnan

Choi

2022

New J. Chem.

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“…In these two portable detection methods, the key influence factor is how to convert the detection signal into a gas pressure signal or a temperature signal. For the gas pressure-based detection method, a number of previous works used catalyst-regulated decomposition of hydrogen peroxide (H 2 O 2 ) or ammonia borane (NH 3 BH 3 ) in a closed container. Recently, photothermal nanoparticle-regulated decomposition of NH 4 HCO 3 was used for gas pressure-based detection .…”

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confidence: 99%

NIR II Light-Response Au Nanoframes: Amplification of a Pressure- and Temperature-Sensing Strategy for Portable Detection and Photothermal Therapy of Cancer Cells

Sun

et al. 2021

Anal. Chem.

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Quantitative detection of cancer cells using portable devices is promising for the development of simple, fast, and pointof-care cancer diagnostic techniques. However, how to further amplify the detection signal to improve the sensitivity and accuracy of detecting cancer cells by portable devices remains a challenge. To solve the problem, we, for the first time, synthesized folic-acidconjugated Au nanoframes (FA-Au NFs) with amplification of pressure and temperature signals for highly sensitive and accurate detection of cancer cells by portable pressure meters and thermometers. The resulting Au NFs exhibit excellent near-infrared (NIR) photothermal performance and catalase activity, which can promote the decomposition of NH 4 HCO 3 and H 2 O 2 to generate corresponding gases (CO 2 , NH 3 , and O 2 ), thereby synergistically amplifying pressure signals in a closed reaction vessel. At the same time, Au NFs with excellent peroxidase-like activity can catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce TMB oxide (oxTMB) with a strong photothermal effect, thereby cooperating with Au NFs to amplify the photothermal signal. In the presence of cancer cells with overexpressing folate receptors (FRs), the molecular recognition signals between FA and FR can be converted into amplified pressure and temperature signals, which can be easily read by portable pressure meters and thermometers, respectively. The detection limits for cancer cells using pressure meters and thermometers are 6 and 5 cells/mL, respectively, which are better than other reported methods. Moreover, such Au NFs can improve tumor hypoxia by catalyzing the decomposition of H 2 O 2 to produce O 2 and perform photothermal therapy of cancer. Together, our work provides new insight into the application of Au NFs to develop a dual-signal sensing platform with amplification of pressure and temperature signals for portable and ultrasensitive detection of cancer cells as well as personalized cancer therapy.

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Photochemical strategies for the green synthesis of ultrathin Au nanosheets using photoinduced free radical generation and their catalytic properties

Cited by 15 publications

References 59 publications

Lateral Growth of Uniformly Thin Gold Nanosheets Facilitated by Two-Dimensional Precursor Supply

Lateral Growth of Uniformly Thin Gold Nanosheets Facilitated by Two-Dimensional Precursor Supply

Encapsulation of atomically thin gold nanosheets within porous silica for enhanced structural stability and superior catalytic performance

NIR II Light-Response Au Nanoframes: Amplification of a Pressure- and Temperature-Sensing Strategy for Portable Detection and Photothermal Therapy of Cancer Cells

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