Loading and release of fluorescent dye from layer-by-layer film-coated magnetic particles in response to hydrogen peroxide

Sato, Katsuhiko; Abe, Eiichi; Takahashi, Mitsumasa; Anzai, Jun Ichi

doi:10.1016/j.jcis.2014.06.039

Cited by 22 publications

(12 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8,9 In contrast, by combining these two metals into a single entity the localized surface plasmon resonance (SPR) can be tuned continuously. 18,19 Electrochemical method is obviously a good choice for the accurate and sensitive detection of HP. 11 In recent years, several methods have been used to synthesize Au-AgNPs which include co-reduction of metal ion precursors, 12 galvanic replacement reaction, 13,14 sonochemistry 15 and laser ablation 16 both in organic and aqueous solutions stabilized with various capping agents.…”

Section: Introductionmentioning

confidence: 99%

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

2016

View full text Add to dashboard Cite

This paper reports the synthesis of gold-silver bimetallic nanoparticles (Au-AgNPs) with different Ag : Au compositions in an aqueous medium and their attachment on a glassy carbon electrode (GCE) via a 1,6-hexadiamine (HDA) linker for the electrochemical reduction of hydrogen peroxide (HP) and nitrobenzene (NB). Initially, silver nanoparticles (AgNPs) were synthesized by the reduction of silver nitrate using trisodium citrate as a capping agent and sodium borohydride as a reducing agent. Then, the Au-AgNPs were prepared by the galvanic displacement of Ag (0) by AuCl 4 À ions. The composition of the Au-AgNPs was varied by changing the mole ratio of Ag : Au in the range of 1 : 0 to 1 : 0.16. TEM images show that the Au-AgNPs were spherical in shape with a diameter of $16 nm. The prepared colloidal solution of Au-AgNPs were then attached on a HDA modified GCE through the Michael's addition reaction and were confirmed by UV-vis diffuse reflectance spectroscopy (DRS), atomic force microscopy (AFM), line scanning analysis, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The AFM image shows that the Au-AgNPs were densely packed on the electrode surface. The Au-AgNPs modified electrode exhibits a higher heterogeneous electron transfer rate constant of 2.77 Â 10 À7 cm s À1 when compared to Ag and AuNPs modified electrodes. Furthermore, the electrocatalytic activity of the Au-AgNPs modified electrode was examined by studying the reduction of HP and NB. It was found that the Au-AgNPs with the Ag : Au mole ratio of 1 : 0.12 showed excellent electrocatalytic activity towards the reduction of both HP and NB by not only shifting their reduction potentials toward less negative potentials but also enhanced their currents compared to the bare GCE, Ag and AuNPs modified electrodes and Au-AgNPs of other molar ratios. The present modified electrode shows the limit of detection of 0.12 and 0.23 mM (S/N ¼ 3) for HP and NB, respectively.Fig. 3 AFM images obtained for (A and B) 2-D and (C and D) 3-D views of AgNPs and Au-AgNPs, modified substrates. (E and F) Line spectra obtained for Au-AgNPs and CV obtained for GC/HDA/Au-AgNPs (Ag : Au ¼ 1 : 0.12) electrode in 0.2 M PB solution (pH 7.2) at a scan rate of 50 mV s À1 . 63438 | RSC Adv., 2016, 6, 63433-63444This journal is

show abstract

Section: Introductionmentioning

confidence: 99%

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

2016

View full text Add to dashboard Cite

show abstract

“…Polymer-coated magnetic particles (MPs) were also prepared to study the binding of fluorescent dye (3-(dansylamino)phenylboronic acid) on the surface and its H 2 O 2 -induced release. For this goal, multilayer films were produced by LbL deposition of shikimic acid-appended poly(allylamine hydrochloride) (SA-PAH) and poly(styrenesulfonate) (PSS) on the surface of MPs [47]. Dual-modal fluorescent-magnetic nanoparticles with surface folic acid have also been produced by co-encapsulation of a far-red/near-infrared (FR/NIR)-emissive conjugated polymer (Poly[9,9-bis(6 -(N,N-dimethylamino)hexyl)fluorenyldivinylene-alt-4,7-(2,1,3,-benzothiadiazole)]) (PFVBT) and lipid-coated iron oxides (IOs) into a mixture of poly(lactic-co-glycolic-acid)-poly(ethylene glycol)-folate (PLGA-PEG-FOL) and PLGA [48].…”

Section: Polymer and Organic Dye Magnetic-fluorescent Nanocompositesmentioning

confidence: 99%

Recent Progress in Synthesis and Functionalization of Multimodal Fluorescent-Magnetic Nanoparticles for Biological Applications

García¹,

Stafford

Gun’ko

2018

Applied Sciences

View full text Add to dashboard Cite

There is a great interest in the development of new nanomaterials for multimodal imaging applications in biology and medicine. Multimodal fluorescent-magnetic based nanomaterials deserve particular attention as they can be used as diagnostic and drug delivery tools, which could facilitate the diagnosis and treatment of cancer and many other diseases. This review focuses on the recent developments of magnetic-fluorescent nanocomposites and their biomedical applications. The recent advances in synthetic strategies and approaches for the preparation of fluorescent-magnetic nanocomposites are presented. The main biomedical uses of multimodal fluorescent-magnetic nanomaterials, including biological imaging, cancer therapy and drug delivery, are discussed, and prospects of this field are outlined.

show abstract

“…Hydrogen peroxide (H 2 O 2 ) as an intermediate plays a fundamental role in many reactions, such as an antiseptic or disinfectant agent, a bleaching agent, and a cleaning agent [1][2][3][4]. Glucose detection is vital in diabetes management, wastewater treatment, food industries, and environmental monitoring [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Among these methods, electrochemical sensors based on electrooxidation of small molecules have gained remarkable attention owing to the advantages of convenient operation, fast response time, and low cost [12][13][14][15]. In recent years, advanced nanomaterials modified electrodes have attracted much attention as the platform for the H 2 [6]. The nanomaterial is indeed successful in achieving high electrochemical activity as the platform to construct the electrochemical sensor.…”

Section: Introductionmentioning

confidence: 99%

A nanoporous palladium-nickel alloy with high sensing performance towards hydrogen peroxide and glucose

Zhao

2015

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Loading and release of fluorescent dye from layer-by-layer film-coated magnetic particles in response to hydrogen peroxide

Cited by 22 publications

References 23 publications

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

Tuning the composition of gold–silver bimetallic nanoparticles for the electrochemical reduction of hydrogen peroxide and nitrobenzene

Recent Progress in Synthesis and Functionalization of Multimodal Fluorescent-Magnetic Nanoparticles for Biological Applications

A nanoporous palladium-nickel alloy with high sensing performance towards hydrogen peroxide and glucose

Contact Info

Product

Resources

About