Monodisperse Noble-Metal Nanoparticles and Their Surface Enhanced Raman Scattering Properties

Shen, Chengmin; Chen, Hui; Yang, Tianzhong; Chen, Xiao; Tian, Jifa; Bao, Lihong; Chen, Shutang; Ding, Hao; Gao, Hongjun

doi:10.1021/cm800882n

Cited by 186 publications

(166 citation statements)

References 47 publications

(88 reference statements)

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“…For example, the classical Brust-Schiffrin route has been widely adopted to prepare Au NPs in a liquid-liquid biphasic system by NaBH 4 reduction [15,16], and the famous ''alcohol reduction" process developed by Toshima's group is another powerful method for the synthesis of Au colloids [11,17]. Recently, Stucky and co-workers reported a one-phase synthetic route to prepare monodisperse Au NPs based on reducing AuPPh 3 Cl with amine-borane complexes in benzene or toluene [18], and Gao's group adopted a simpler protocol for the synthesis of monodisperse Au NPs from the reduction of HAuCl4 by oleylamine [19].…”

Section: Introductionmentioning

confidence: 99%

Ammonium bicarbonate reduction route to uniform gold nanoparticles and their applications in catalysis and surface-enhanced Raman scattering

Yang

2011

Nano Res.

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A new protocol for the synthesis of nearly monodisperse gold nanoparticles with controllable size is described. The pathway is based on the reduction of AuCl 4 -by ammonium bicarbonate in the presence of sodium stearate under hydrothermal conditions. The particle sizes could be easily tuned by regulating the reaction conditions including precursor concentration, reaction temperature and growth time. A tentative explanation for the reduction and growth mechanism of uniform gold nanoparticles has been proposed. The as-prepared gold particles showed good catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol by excess NaBH 4 , and a surface-enhanced Raman scattering (SERS) study suggested that the gold nanoparticles exhibited a high SERS effect on the probe molecule Rhodamine 6G.

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Section: Introductionmentioning

confidence: 99%

Ammonium bicarbonate reduction route to uniform gold nanoparticles and their applications in catalysis and surface-enhanced Raman scattering

Yang

2011

Nano Res.

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“…The Au NPs employed in the current study were hydrophilic (3-mercaptopropionic acid-capped Au NPs), which were obtained through ligand exchange of hydrophobic Au NPs (oleylamine-capped Au NPs). The specific process for synthesizing Au NPs was presented by reference [27] in detail. The final product was dissolved in deionized water to give a bluish dispersion.…”

Section: Methodsmentioning

confidence: 99%

Fluorescence enhancement of acridine orange in a water solution by Au nanoparticles

Zheng

Zhang

et al. 2010

Sci. China Phys. Mech. Astron.

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The surface enhanced fluorescence effect of acridine orange fluorophore in the proximity of Au nanoparticles has been investigated experimentally in the system of aqueous solution. Significant enhancement of the fluorescence intensity was observed when the system was excited with 532 nm or 442 nm CW lasers. The influence of the distances between neighboring Au particles as well as that between the fluorophore molecules and the Au surface were explored experimentally. The results demonstrated that a compact distribution of metallic particles was able to produce stronger fluorescence enhancement. Proper separation between the fluorophore molecules and the metal surface was favorable for a better enhancement. surface enhanced fluorescence, local field enhancement, acridine orange, hydrophilic Au nanoparticle PACS: 42.62.Fi, 68.49.Uv, 33.50.Dq, 87.64.NiAs a powerful and broadly used method, fluorescence emission and detection enable the revolution in medical diagnostics, DNA sequencing, and genomics [1]. But it is often limited by low quantum yields and poor photostability in many practical applications [2]. To overcome these difficulties, new approaches for increasing the sensitivity of the detection on the target have been developed [3]. It has been found that the metallic surface has the ability to drastically alter emission of vicinal fluorophores and to enhance the fluorescence intensity [2]. The phenomenon is termed surface enhanced fluorescence (SEF) or metal enhanced fluorescence (MEF) [4]. Investigation of the influence of a metallic surface on the fluorescence emission has a long scientific history, perhaps starting with Drexhage's work [5,6]. Possible mechanisms proposed for understanding experimental observations of SEF include the lighting rod effect, local field effect induced by surface plasmon resonance [7],

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“…Besides, in many approaches, the surfactant in solution, which has the primary role to prevent the aggregation of NPs by providing an electrostatic or steric repulsion between them [18] simultaneously used as the reducing agent. State examples are the case of the Au NPs synthetized with sodium citrate [9], or oleylamine [19], or for the nucleation of Au on CoPt 3 NPs with dodecylamine, playing a dual role [20]. This dual role of the surfactant is often required, to control the nucleation and growth steps occurring at all stages of the particle formation, and has a direct influence in the size and size distribution of the resulting NPs.…”

Section: +3mentioning

confidence: 99%

One-Pot Synthesis of Cationic Gold Nanoparticles by Differential Reduction

Sperling

García‐Fernández

Ojea-Jiménez

et al. 2016

Zeitschrift Für Physikalische Chemie

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Abstract:The size-controlled synthesis of cationic particles by differential reduction of HAuCl 4 precursor in the presence of NaBH 4 and 1-aminoundecane-12-thiol (AUT) is reported. The number of seed particles is determined by the fraction of the initially Au precursor reduced by NaBH 4 present in the reaction mixture, which are then grown larger by the AUT, acting as both weak reducing agent and stabilizing surfactant. By this methodology, size controlled synthesis is achieved in a two-step one-pot synthesis at room temperature.

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Monodisperse Noble-Metal Nanoparticles and Their Surface Enhanced Raman Scattering Properties

Cited by 186 publications

References 47 publications

Ammonium bicarbonate reduction route to uniform gold nanoparticles and their applications in catalysis and surface-enhanced Raman scattering

Ammonium bicarbonate reduction route to uniform gold nanoparticles and their applications in catalysis and surface-enhanced Raman scattering

Fluorescence enhancement of acridine orange in a water solution by Au nanoparticles

One-Pot Synthesis of Cationic Gold Nanoparticles by Differential Reduction

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