The density of surface ligands regulates the luminescence of thiolated gold nanoclusters and their metal ion response

Jia-dong, XU; Li, Juanmin; Zhong, Wencheng; Wen, Mengyao; Sukhorukov, Gleb B.; Li, Shang

doi:10.1016/j.cclet.2021.02.037

Cited by 32 publications

(13 citation statements)

References 39 publications

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“…On the one hand, the pre‐concentration of DPA‐AuNCs will remove free ligands from the AuNC solutions, which will weaken the stability of these ultrasmall metal NCs according to previous reports. [ 52,53 ] On the other hand, concentrated AuNC solution will facilitate the inter‐particle interactions owing to significantly increased collision chances of nearby particles in the solution. In order to further understand the growth process and gelation mechanism of Au hydrogels based on AuNCs, time‐lapse ex situ TEM imaging and in situ optical spectroscopy were conducted to monitor the time‐dependent growth process.…”

Section: Resultsmentioning

confidence: 99%

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Jia-dong

Sun

et al. 2022

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Metal aerogels represent an emerging type of functional porous materials with promising applications in diverse fields, but the fabrication of metal aerogels with specific structure and property still remains a challenge. Here, the authors report a new approach to fabricate metal aerogels by using ultrasmall metal nanoclusters (NCs) as functional building blocks. By taking D‐penicillamine‐stabilized gold NCs (AuNCs) with a diameter of 1.4 nm as an example, Au aerogels with ultrafine ligament size (3.5 nm) and good enzyme‐mimic properties are synthesized. Detailed characterization shows that the obtained Au aerogels possess typical 3D self‐supported porous network structure with high gold purity and surface area. Time‐lapse spectroscopic and microscopic monitoring of the gelation process reveal that these ultrasmall AuNCs first grow into large nanoparticles before fusion into nanowire networks, during which both pH and the precursor concentration are identified to be the determining factor. Owing to their highly porous structure and abundant metal nodes, these self‐supported Au aerogels display excellent peroxidase‐like properties. This work provides a strategy for fabricating advanced metal aerogels by taking ultrasmall‐sized metal NCs as building blocks, which also opens new avenues for engineering the structure and properties of metal aerogels for further advancing their applications.

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Section: Resultsmentioning

confidence: 99%

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Jia-dong

Sun

et al. 2022

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“…XPS analysis also showed that the binding energy (BE) of Au 4f 7/2 (84.3 eV) falls between the BE of Au(0) (84.0 eV) and Au(I) (86.0 eV), which is in good agreement with previous reports of AuNCs (Figure S4). [ 45–49 ] Apparently, the pre‐incorporation of CMTE into BSA does not affect its capability of generating luminescent AuNCs despite the slight decrease of the quantum yield.…”

Section: Resultsmentioning

confidence: 99%

Site‐specific fabrication of gold nanocluster‐based fluorescence photoswitch enabled by the dual roles of albumin proteins

Zhong

Yan

et al. 2022

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Fluorescence photoswitch is becoming increasingly desirable for many applications, but its controllable fabrication still remains challenging yet. In this paper, a new strategy is proposed to fabricate fluorescence photoswitch by harnessing dual roles of albumin proteins as both photochrome carriers and biotemplates of fluorophore. As an example, we demonstrated the successful fabrication of a fluorescence photoswitch by incorporating both the photochromic diarylethene dye (CMTE) and red‐emitting fluorescent gold nanoclusters (AuNCs) into the specific domains of bovine serum albumin (BSA) in a highly controllable manner. Detailed spectral and photophysical characterisation showed that CMTE well‐retains the photochromic properties within the CMTE–BSA–AuNC construct, although its photoconversion rate is slightly retarded. Different from previously reported photoswitches, the fluorescence of the present system is mainly modulated via the inner filter effect (IFE) mechanism, which exhibits high switching efficiency with an on–off ratio up to 90%, reversible fluorescence response and good antifatigue performance. This work provides a new, generable albumin protein‐assisted strategy of fabricating advanced fluorescence photoswitch, which can find wide applications in biological, optical and information fields.

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“…Upon 5d 10 -5d 10 interactions between Au + and Hg 2+ , the electronic structure of AuNCs changes, causing the fluorescence quenching of AuNCs, which enables the detection of Hg 2+ based on MOF/AuNCs assemblies [ 30 , 36 , 37 , 107 ]. For instance, BSA-protected AuNCs were synthesized in the presence of Zr-MOFs (UiO-66), resulting in the formation of red-emitting AuNCs@UiO-66 with a high quantum yield (11%) [ 68 ].…”

Section: Luminescence Sensingmentioning

confidence: 99%

“…On account of the advantages mentioned above, AuNCs have been widely applied in various fields, including catalysis [ 25 , 27 ], bioimaging [ 28 , 29 ], sensing [ 30 , 31 ], anticancer therapy [ 32 ], and antisepsis [ 33 – 35 ]. Particularly, in sensing fields, AuNCs have been intensively exploited as novel probes for the sensing of a wide range of different analytes, such as metal ions [ 36 , 37 ], biomolecules [ 38 , 39 ], temperature [ 40 ], small molecules [ 41 ], bacteria [ 42 ], cancer cells [ 43 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Frameworks-Mediated Assembly of Gold Nanoclusters for Sensing Applications

Wang

Tan

et al. 2022

J. Anal. Test.

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Gold nanoclusters (AuNCs) are an emerging type of ultrasmall nanomaterials possessing unique physicochemical characteristics. Metal–organic frameworks (MOFs), a singular kind of porous solid and crystalline material, have attracted tremendous attention in recent years. The combination of AuNCs and MOFs can integrate and improve the prominent properties of both components, such as high catalytic activities, tunable optical properties, good biocompatibility, surface functionality and stability, which make the composites of MOFs and AuNCs promising for sensing applications. This review systematically summarizes the recent progress on the sensing of various analytes via MOFs-mediated AuNCs assemblies based on strategies of luminescence sensing, colorimetric sensing, electrochemiluminescence sensing, and electrochemical and photoelectrochemical sensing. A brief outlook regarding the future development of MOFs-mediated AuNCs assemblies for sensing application is presented as well.

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The density of surface ligands regulates the luminescence of thiolated gold nanoclusters and their metal ion response

Cited by 32 publications

References 39 publications

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Ultrasmall Gold Nanoclusters‐Enabled Fabrication of Ultrafine Gold Aerogels as Novel Self‐Supported Nanozymes

Site‐specific fabrication of gold nanocluster‐based fluorescence photoswitch enabled by the dual roles of albumin proteins

Metal–Organic Frameworks-Mediated Assembly of Gold Nanoclusters for Sensing Applications

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