Synthesis and Optical Characterization of Thermosensitive, Luminescent Gold Nanodots

Bomm, Jana; Günter, Christina; Stumpe, Joachim

doi:10.1021/jp206260r

Cited by 13 publications

(7 citation statements)

References 32 publications

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“…These results give strong evidences that the modified Au 25 NCs can be potential application in bioanalysis in conjunction with therapeutics because of simultaneous excellent properties of fluorescence and electron–phonon coupling. Bomm et al observed a high quantum PL efficiency of 16.6% in their Au NCs at room temperature; it was further improved to a value of 28.6% when cooling to −7 °C.…”

Section: Optical Properties Of Gold Nanoclustersmentioning

confidence: 98%

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Wen

Toh

et al. 2014

Part. Part. Syst. Charact.

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Atomically precise Au nanoclusters (NCs) have emerged as fascinating fluorescent nanomaterials and attracted considerable research interest in both fundamental research and practical applications. Due to enhanced quantum confinement, they possess extraordinary optical, electronic, and magnetic properties and therefore are very promising for a wide range of applications, including biosensing, bioimaging, catalysis, photonics, and molecular electronics. Remarkable progress has been reported for the fundamental understanding, synthesis techniques, and applications. In this review, the updated advances are summarized in Au NCs, including synthesis techniques, optical properties, and applications. In particular, we focus on the optical properties and electron dynamic processes. In addition, the progress in other noble metallic NCs is included in this Review, such as Ag, Cu, Pt, and alloy, which have attracted much research interest recently. Finally, an outlook is presented for such fascinating nanomaterials in both aspects of future fundamental research and potential applications.

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Section: Optical Properties Of Gold Nanoclustersmentioning

confidence: 98%

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Wen

Toh

et al. 2014

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“…Luminescence thermometry is considered to be one of the most promising non-contact techniques for temperature determination at the sub-micrometer and nanometer scale due to its very high spatial, thermal, and temporal resolutions, large measurement ranges and affordable costs (Brites et al, 2012; Jaque and Vetrone, 2012). A big number of materials has been studied for luminescence nanothermometry applications, including quantum dots (Maestro et al, 2010, 2014; Vlaskin et al, 2010; Benayas et al, 2015), organic dyes (Peterman et al, 2003; Steinegger et al, 2017; Xie et al, 2017), gold nanoparticles (Bomm et al, 2012; Shang et al, 2013), polymers (Graham et al, 2010; Okabe et al, 2012; Hannecart et al, 2015), and lanthanide doped materials (Cheng et al, 2013; Zheng et al, 2014; Cerón et al, 2015; Piñol et al, 2015; Zhu et al, 2016; Balabhadra et al, 2017). The different measurement techniques used, and based on changes in radiative lifetimes, intensity variations, spectral position shifting, and broadening of emission lines induced by temperature, have proved to be potential tools for temperature determination even in biosystems (Vetrone et al, 2010; Fischer et al, 2011; Du et al, 2014; Zhu et al, 2016; Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Mapping Temperature Distribution Generated by Photothermal Conversion in Graphene Film Using Er,Yb:NaYF4 Nanoparticles Prepared by Microwave-Assisted Solvothermal Method

et al. 2019

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This study analyzes the mapping of temperature distribution generated by graphene in a glass slide cover after illumination at 808 nm with a good thermal resolution. For this purpose, Er,Yb:NaYF 4 nanoparticles prepared by a microwave-assisted solvothermal method were used as upconversion luminescent nanothermometers. By tuning the basic parameters of the synthesis procedure, such as the time and temperature of reaction and the concentration of ethanol and water, we were able to control the size and the crystalline phase of the nanoparticles, and to have the right conditions to obtain 100% of the β hexagonal phase, the most efficient spectroscopically. We observed that the thermal sensitivity that can be achieved with these particles is a function of the size of the nanoparticles and the crystalline phase in which they crystallize. We believe that, with suitable changes, these nanoparticles might be used in the future to map temperature gradients in living cells while maintaining a good thermal resolution.

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“…8,9 Among them, luminescent gold NCs (AuNCs) are attractive for a wide variety of biomedical applications, such as biosensing, in vitro and in vivo imaging, and also in cancer therapy, owing to their low toxicity, good biocompatibility and multifunctional surface chemistry. 12,13 However, this kind of intensity-based temperature sensors would be affected by local environment including oxygen content, pH, concentration and usually gave inaccurate temperature information. 12,13 However, this kind of intensity-based temperature sensors would be affected by local environment including oxygen content, pH, concentration and usually gave inaccurate temperature information.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 More importantly, AuNCs showed temperature sensitivity of their luminescence and could be used recently as versatile nanothermometry devices in living cells. 12,13 However, this kind of intensity-based temperature sensors would be affected by local environment including oxygen content, pH, concentration and usually gave inaccurate temperature information. 14 It is well known that temperature is one of the most important parameters that governs biological reactions within a living cell.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoclusters based dual-emission hollow TiO₂ microsphere for ratiometric optical thermometry

et al. 2015

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In this work, we develop a novel dual-emitting hollow TiO 2 microsphere with high stability and attractive thermal sensitivity, which could work as nanosensor for accurately measuring temperature. This nanosensor is prepared through coating gold nanocluster (AuNCs) on the surface of carbon dots-doped hollow TiO 2 microsphere. As-prepared nanosensor shows characteristic dual-emitting property of carbon dots (CDs, blue fluorescence) and AuNCs (red fluorescence) under a single excitation wavelength. Moreover, upon increasing the temperature, the intensity of red emission from the AuNCs continuously quenched, whereas that of blue emission from the CDs remained nearly constant. The different response results in a continuous fluorescence color change from red to purple that can be clearly observed by the naked eyes. Thus, as-prepared dual-emitting hollow TiO 2 microsphere could be used as optical thermometry by taking the advantage of the temperature sensitivity of their fluorescence intensity ratio (red/blue) with high reliability and accuracy, which change considerably over the wide temperature range (20-80 C) with small temperature resolution ($0.5 C). Additionally, this nanosensor is successfully applied in 10 mM buffered saline (PBS) solution with physiological temperature ranging from 20 to 45 C, which suggests as-prepared dual-emitting microspheres have promising applications in vivo temperature sensing. Fig. 3 TEM image of (a) CDs; (b) CDs/TiO 2 hollow microspheres; (c) AuNCs; (d) dual-emission fluorescent microspheres.This journal is

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Synthesis and Optical Characterization of Thermosensitive, Luminescent Gold Nanodots

Cited by 13 publications

References 32 publications

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Mapping Temperature Distribution Generated by Photothermal Conversion in Graphene Film Using Er,Yb:NaYF4 Nanoparticles Prepared by Microwave-Assisted Solvothermal Method

Gold nanoclusters based dual-emission hollow TiO₂ microsphere for ratiometric optical thermometry

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Synthesis and Optical Characterization of Thermosensitive, Luminescent Gold Nanodots

Cited by 13 publications

References 32 publications

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Fluorescent Metallic Nanoclusters: Electron Dynamics, Structure, and Applications

Mapping Temperature Distribution Generated by Photothermal Conversion in Graphene Film Using Er,Yb:NaYF4 Nanoparticles Prepared by Microwave-Assisted Solvothermal Method

Gold nanoclusters based dual-emission hollow TiO2 microsphere for ratiometric optical thermometry

Contact Info

Product

Resources

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Gold nanoclusters based dual-emission hollow TiO₂ microsphere for ratiometric optical thermometry