Hg(II) Ion Detection Using Thermally Reduced Graphene Oxide Decorated with Functionalized Gold Nanoparticles

Chen, Ke-Hung; Lu, Ganhua; Chang, Jingbo; Mao, Shun; Yu, Kehan; Cui, Shumao; Chen, Junhong

doi:10.1021/ac3000336

Cited by 229 publications

(126 citation statements)

References 31 publications

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“…Besides employing the neutral PNA as the probe to enhance the detection sensitivity, decoration of nanoparticles is an additional method to enhance DNA detection sensitivity (Zhang et al, 2007;Chen et al, 2012). As known, since one nanoparticle can be modified with many PNA probes, the immobilized PNA probes are able to bind more target miRNA, thus increasing the hybridization efficiency.…”

Section: Introductionmentioning

confidence: 99%

Gold nanoparticles-decorated graphene field-effect transistor biosensor for femtomolar MicroRNA detection

Cai

Huang

Zhang

et al. 2015

Biosensors and Bioelectronics

184

114

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Section: Introductionmentioning

confidence: 99%

Gold nanoparticles-decorated graphene field-effect transistor biosensor for femtomolar MicroRNA detection

Cai

Huang

Zhang

et al. 2015

Biosensors and Bioelectronics

184

114

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“…S3c). We reasoned that the carboxyl groups of TGA exposed on the outer surface of the gold nanoparticles are able to interact with Pb 2+ via interparticle crosslinking mechanism [36] (Fig. S4).…”

Section: +mentioning

confidence: 99%

Ligand exchange on the surface of cadmium telluride quantum dots with fluorosurfactant-capped gold nanoparticles: Synthesis, characterization and toxicity evaluation

Wang¹,

Zhang²,

Lu³

et al. 2014

Journal of Colloid and Interface Science

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a b s t r a c tCdTe quantum dots (QDs) can provide high-intensity and photostable luminescent signals when they are used as labeling materials for sensing trace amounts of bioanalytes. However, a major concern is whether the capping ligands of CdTe QDs cause toxic effects in living systems. In the current study, we address this problem through the complete ligand transformation of CdTe QDs from toxic thiolglycolic acid (TGA) to green citrate, which is attributed to the CdAS bond breaking and the AuAS bond formation. The highly efficient depletion of S atom from the surface of the CdTe QDs occurs after the addition of fluorosurfactant (FSN)-capped gold nanoparticles into TGA-capped CdTe QDs, accompanying with the rapid aggregation of FSN-capped gold nanoparticles via noncrosslinking mechanism in the presence of high salt. After the ligand transformation, negligible differences are observed on both photoluminescence spectra and luminescent quantum yield. In addition, the cytotoxicity of the original and new-born CdTe QDs is detected by measuring cell viability after the nanoparticle treatment. In comparison with the original TGA-capped QDs, the new-born CdTe QDs can induce minimal cytotoxicity against human hepatocellular liver carcinoma (HepG2) cells even at high dosages. Our study indicates that the extremely simple method herein opens up novel pathways for the synthesis of green CdTe QDs, and the as-prepared citrate-capped CdTe QDs might have great potential for biological labeling and imaging applications.

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“…This RGO-FETs were able to detect Ca 2+ , Mg 2+ , Hg 2+ and Cd 2+ via the change of conductance caused by the adding of target metal ions. Considering the relatively complex fabrication procedure of protein-based FET sensors, Chen et al [84] ) and faster responses (less than 10 s) (Figure 6(b)), and it would be a promising detector of Hg 2+ providing fast, realtime, simple detection with high sesitivity and selectivity.…”

Section: +mentioning

confidence: 99%

Applications of graphene-based materials in environmental protection and detection

Yang

et al. 2013

Chin. Sci. Bull.

100

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Many efficient adsorbents and sensors based on graphene and functionalized graphene have been constructed for the removal and detection of environmental pollutants due to its unique physicochemical properties. In this article, recent research achievements are reviewed on the application of graphene-based materials in the environmental protection and detection. For environmental protection, modified graphene can adsorb heavy metal ions in a high efficiency and selectivity, and thus reduces them to metals for recycling. High adsorption capacity of graphene-based materials to kinds of organic pollutants in water was also presented. Several graphene-based sensors with high limit of detection were reported to detect heavy metal ions, toxic gases and organic pollutants in environment. Finally, a perspective on the future challenge of adsorbents and detection devices based on graphene is given. Environmental pollution especially toxic gases, heavy metal ions and organic pollutants in air and water, caused by industry and agricultural activities, severely threaten ecological balance and human health, and have received extensive attention worldwide. For example, the heavy metal ions in bodies accumulated from the food chains will cause various chronic diseases. Therefore, it is necessary to develop simple, sensitive and inexpensive methods to remove and detect these pollutants. Currently, many efficient adsorbents and sensitive detection devices based on nanomaterials especially graphene have been designed due to their unique chemical, thermal, electronic, and mechanical properties. Graphene, a two-dimensional (2D) one atom thick nanomaterial consisting of sp 2 -hybridized carbon, has attracted great interest among scientists due to its unique properties, including high specific surface area (SSA) of 2600 m 2 g −1 [1], excellent thermal conductivities of 5000 W mhigh-speed electron mobility of 200000 cm 2 V −1 s −1 at room temperature [3], high stiffness and strength with Young's modulus of around 1000 GPa and break strength of 130 GPa [4], extraordinary electrocatalytic activity [5] and optical properties [6]. These outstanding physicochemical properties indicate its potential application in many research fields. For example, considering the high surface area and strong adsorption capacity of graphene, many efficient adsorbents [7] and photocatalysts [8] are developed for the removal and photocatalytic degradation of pollutants. Moreover, based on the excellent electrical conductivity and optical properties of graphene, many sensitive electrochemical [9] and fluorescent [10] sensors are also designed for the detection of pollutants. However, aggregations of graphene decrease its available surface area and further reduce its adsorption capacity. Functionalization of graphene with molecules, which have water-solubility and affinity toward target analytes, will improve the selectivity of adsorbents or detection devices, as well as prevent the aggregation. Based on this

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Hg(II) Ion Detection Using Thermally Reduced Graphene Oxide Decorated with Functionalized Gold Nanoparticles

Cited by 229 publications

References 31 publications

Gold nanoparticles-decorated graphene field-effect transistor biosensor for femtomolar MicroRNA detection

Gold nanoparticles-decorated graphene field-effect transistor biosensor for femtomolar MicroRNA detection

Ligand exchange on the surface of cadmium telluride quantum dots with fluorosurfactant-capped gold nanoparticles: Synthesis, characterization and toxicity evaluation

Applications of graphene-based materials in environmental protection and detection

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