Understanding the Photothermal Conversion Efficiency of Gold Nanocrystals

Chen, Huanjun; Shao, Lei; Tian, Mingzhen; Sun, Zhenhua; Zhao, Chunmei; Yang, Baocheng; Wang, Jianfang

doi:10.1002/smll.201001109

Cited by 550 publications

(527 citation statements)

References 35 publications

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“…Metal NPs combine with biocompatible polymers (e.g., polyethylene glycol or chitosan), which can extend their in vivo circulation as a carrier for drug and gene delivery [35,36]. Moreover, metal NPs can convert light or radiofrequencies into heat, which causes thermal ablation of the targeted cancer cells [37,38]. In this regard, the ability of Au NPs to convert absorbed light proficiently into localized heat can be applied for selective photothermal therapy for cancer [21,22] or bacterial infection.…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

Metal, Metalloid, and Oxide Nanoparticles for Therapeutic and Diagnostic Oncology

Yazdi¹,

Sepehrizadeh²,

Mahdavi³

et al. 2016

Nano BioMed ENG

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Nanoparticles have comprehensively affected various sights of human life. Through the wide range of claims about nanosized particles and their functions, biomedical applications are of much interest among health care researchers due to the nanoparticles' potential for use in the process of disease diagnosis, control and treatment. In this regard, inorganic nanoparticles, which have high potential in diagnostic and therapeutic systems, have recently received much attention in oncology. Although inorganic nanoparticles initially seemed an appropriate tool for cancer imaging and diagnosis, their ability to attack cancerous cells as anticancer drugs or carriers in other drugs has also demonstrated promising results. The present review primarily provides a brief survey of various studies in which metal nanoparticles such as gold, silver, iron oxide, and metalloid nanoparticles viz. tellurium and bismuth were exploited for therapeutic or diagnostic purposes in oncology. Then the application of selenium nanoparticles as a therapeutic agent against cancer in in vitro and in vivo studies is reviewed in detail. Although inorganic nanoparticles seem to be useful tools for cancer imaging and diagnosis, their potential for attacking cancerous cells as anticancer substances or even carriers for anticancer medications should not be underestimated.

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Section: Metal Nanoparticlesmentioning

confidence: 99%

Metal, Metalloid, and Oxide Nanoparticles for Therapeutic and Diagnostic Oncology

Yazdi¹,

Sepehrizadeh²,

Mahdavi³

et al. 2016

Nano BioMed ENG

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“…In fact, most light absorbers generate heat via nonradiative relaxation. Because of their extremely large absorption coefficients, plasmonic nanomaterials can convert the photon energy into heat energy at very low concentration, several orders of magnitude lower than that of other materials [25]. The temperature profile over time can be described by Eqn.…”

Section: Absorptionmentioning

confidence: 99%

Plasmonic Nanostructures for Biomedical and Sensing Applications

Jenkins

Muldoon

Chen

2014

Metallic Nanostructures

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Noble metal nanostructures are appealing for therapeutic, diagnostics, and sensing applications because of their unique optical properties and biocompatibility. The collective oscillation of electrons in a metal nanostructure resonates with particular wavelengths of light, generating the localized surface plasmon resonance (LSPR). The LSPR results in absorption and scattering of incoming photons. Absorption leads to photothermal generation of heat, photoluminescence, and quenching of fluorophores in close proximity. Scattering results in reflected photons and its amplification of the local electromagnetic field can enhance fluorescence, phosphorescence, and Raman scattering. These optical properties make plasmonic nanostructures ideal candidates for theranostic applications including light-induced thermal therapy, drug/gene delivery, and biomedical imaging. The use of plasmonic nanostructures for ex vivo detection of chemicals and biomolecules are also discussed in this chapter.

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“…[8] A subsequent temperature plateau indicates that at hermal equilibrium is reached, in which the photothermal heat generation is balanced by heat dissipation through thermal conduction to the entire graphene shell, the encapsulated water, and the environment. In contrast, no temperature change is observed on an irradiated 40 mLwater droplet (to be discussed later), affirming that the photothermal responses of our GLM originate from their graphene shells.T he photothermal efficiencyo fG LM (h), which is the ratio of the thermal energy to the total irradiation energy, [12] is estimated to be 15 %( Figure S7) and is comparable to most graphenebased photothermal agents.…”

mentioning

confidence: 97%

Graphene Liquid Marbles as Photothermal Miniature Reactors for Reaction Kinetics Modulation

et al. 2015

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Abstract:We demonstrate the fabrication of graphene liquid marbles as photothermal miniature reactors with precise temperature control for reaction kinetics modulation. Graphene liquid marbles show rapid and highly reproducible photothermal behavior while maintaining their excellent mechanical robustness.B yt uning the applied laser power, swift regulation of graphene liquid marbles surface temperature between 21-135 8 8Ca nd its encapsulated water temperature between 21-74 8 8Ca re demonstrated. The temperature regulation modulates the reaction kinetics in our graphene liquid marble,a chieving a1 2-fold superior reaction rate constant for methylene blue degradation than at room temperature.Liquid marbles are formed by the spontaneous encapsulation of liquid droplets by pulverized solid particles.[1] They are promising miniature reactors owing to their ability to isolate microliter liquid, ease of fabrication, and excellent mechanical robustness.[2] Such miniature reactor is ideal for reactions involving costly and hazardous reagents/processes,and useful in preliminary reaction screening. Liquid marble reactors have been applied for blood typing, [3] nanocomposite synthesis, [4] photochemical polymerization, [5] and heterogeneous catalysis.[6] However,c urrent applications of liquid marble reactors are restricted to reactions of low activation energy or at room temperature due to the lack of aheating mechanism. It is essential to incorporate aheating mechanism into liquid marble to broaden its application for reactions requiring precise control and elevated temperature.Graphene is ap romising candidate for heatable liquid marble miniature reactor due to their excellent photothermal properties.[7] Their strong photoabsorption over awide range of wavelengths allows rapid and localized heating upon vibrational relaxation of photoexcited electrons.[8] Currently, the incorporation of graphene are mainly in the form of suspensions or films, [9] which require tedious reactant/product recovery procedures,a nd/or film fabrication protocols. Hence,t he combination of graphene and liquid marble allows easy-to-prepare heatable miniature reactor,a nd permits abroad range of processes with precise temperature and reaction kinetic control. Notably,the localized photothermal heating is crucial as thermal energy is supplied to the smallvolume reaction on-demand without changing the bulk liquid medium temperature.[10] This reduces the evaporation issues of miniature reactors and minimizes energy waste,m aking it superior to conduction/convection heating. [10] Herein, we demonstrate the fabrication of graphene liquid marbles (GLM) and their application as remotely heatable miniature reactors for reaction kinetic modulation. The physical and mechanical properties of GLM as isolated and robust miniature reactors are characterized. We then demonstrate the instant heating of GLM with surface temperatures tunable between 21 to 135 8 8Cb yc ontrolling the laser power. Theactual encapsulated water temperature is probed using temperature-d...

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Understanding the Photothermal Conversion Efficiency of Gold Nanocrystals

Cited by 550 publications

References 35 publications

Metal, Metalloid, and Oxide Nanoparticles for Therapeutic and Diagnostic Oncology

Metal, Metalloid, and Oxide Nanoparticles for Therapeutic and Diagnostic Oncology

Plasmonic Nanostructures for Biomedical and Sensing Applications

Graphene Liquid Marbles as Photothermal Miniature Reactors for Reaction Kinetics Modulation

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