Controllable Aggregation and Reversible pH Sensitivity of AuNPs Regulated by Carboxymethyl Cellulose

Tan, Junjun; Liu, Ruigang; Wang, Wen; Liu, Wenyong; Tian, Ye; Wu, Min; Huang, Yong

doi:10.1021/la902593e

Cited by 80 publications

(61 citation statements)

References 48 publications

(67 reference statements)

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“…It is a rapid process and avoids the need of complex synthesis process. However, any change in physical parameters (pH, ionic strength etc) results in the detachment of the ligand molecule [32]. For example, interaction of Pb 2+ changes the structure of ss-DNA bound to citrate capped GNP into ds-DNA, leading to destabilization of GNPs, because ss-DNA bind more strongly to GNP compared to ds-DNA [33,34].…”

Section: Functionalization Of Gold Nanoparticlesmentioning

confidence: 99%

Gold nanoparticles as efficient sensors in colorimetric detection of toxic metal ions: A review

Priyadarshini

Pradhan

2017

Sensors and Actuators B: Chemical

497

198

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Section: Functionalization Of Gold Nanoparticlesmentioning

confidence: 99%

Gold nanoparticles as efficient sensors in colorimetric detection of toxic metal ions: A review

Priyadarshini

Pradhan

2017

Sensors and Actuators B: Chemical

497

198

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“…Since solvents for cellulose are either toxic, such as N 2 O 4 /DMF, or hard to remove, such as N , N -dimethylacetamide/LiCl, most of the chemical modifications in homogeneous conditions start with cellulose derivatives, which can be dissolved in water or common organic solvents, including carboxymethyl cellulose (CMC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC), and cellulose acetate (CA). More interestingly, CMC with a high degree of substitution (DS) of carboxymethyl groups is a pH-responsive polyelectrolyte similar to poly(acrylic acid) [29,30], with p K a around 3–4 [31]. HPC is a temperature-responsive derivative of natural macromolecules, and exhibits a lower critical solution temperature (LCST) in aqueous solution at about 41 °C [32,33] and a remarkable hydration–dehydration change in aqueous solution in response to relative changes in temperature around the LCST.…”

Section: Preparation Strategiesmentioning

confidence: 99%

“Smart” Materials Based on Cellulose: A Review of the Preparations, Properties, and Applications

2013

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Cellulose is the most abundant biomass material in nature, and possesses some promising properties, such as mechanical robustness, hydrophilicity, biocompatibility, and biodegradability. Thus, cellulose has been widely applied in many fields. “Smart” materials based on cellulose have great advantages—especially their intelligent behaviors in reaction to environmental stimuli—and they can be applied to many circumstances, especially as biomaterials. This review aims to present the developments of “smart” materials based on cellulose in the last decade, including the preparations, properties, and applications of these materials. The preparations of “smart” materials based on cellulose by chemical modifications and physical incorporating/blending were reviewed. The responsiveness to pH, temperature, light, electricity, magnetic fields, and mechanical forces, etc. of these “smart” materials in their different forms such as copolymers, nanoparticles, gels, and membranes were also reviewed, and the applications as drug delivery systems, hydrogels, electronic active papers, sensors, shape memory materials and smart membranes, etc. were also described in this review.

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“…Typical sensor characteristics associated with the proposed sensing methods are compared with the other reported methods and the comparison is provided in Table 1 163940414243444546474849505152535455. This comparison suggests the proposed material exhibits a comparable and in some cases even better detection limit and sensitivity values than the other reported methods and materials.…”

Section: Resultsmentioning

confidence: 91%

Multimodal Sensing Strategy Using pH Dependent Fluorescence Switchable System

Muthurasu

Ganesh

2016

Sci Rep

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Biomolecules assisted preparation of fluorescent gold nanoparticles (FL–Au NPs) has been reported in this work using glucose oxidase enzyme as both reducing and stabilizing agent and demonstrated their application through multimodal sensing strategy for selective detection of cysteine (Cys). Three different methods namely fluorescence turn OFF–ON strategy, naked eye detection and electrochemical methods are used for Cys detection by employing FL–Au NPs as a common probe. In case of fluorescence turn–OFF method a strong interaction between Au NPs and thiol results in quenching of fluorescence due to replacement of glucose oxidase by Cys at neutral pH. Second mode is based on fluorescence switch–ON strategy where initial fluorescence is significantly quenched by either excess acid or base and further addition of Cys results in appearance of rosy-red and green fluorescence respectively. Visual colour change and fluorescence emission arises due to etching of Au atoms on the surface by thiol leading to formation of Au nanoclusters. Finally, electrochemical sensing of Cys is also carried out using cyclic voltammetry in 0.1 M PBS solution. These findings provide a suitable platform for Cys detection over a wide range of pH and concentration levels and hence the sensitivity can also be tuned accordingly.

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Controllable Aggregation and Reversible pH Sensitivity of AuNPs Regulated by Carboxymethyl Cellulose

Cited by 80 publications

References 48 publications

Gold nanoparticles as efficient sensors in colorimetric detection of toxic metal ions: A review

Gold nanoparticles as efficient sensors in colorimetric detection of toxic metal ions: A review

“Smart” Materials Based on Cellulose: A Review of the Preparations, Properties, and Applications

Multimodal Sensing Strategy Using pH Dependent Fluorescence Switchable System

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