Au nanoparticles grafted on Fe3O4 as effective SERS substrates for label-free detection of the 16 EPA priority polycyclic aromatic hydrocarbons

Du, Jingjing; Xu, Jianwei; Sun, Zhenli; Jing, Chuanyong

doi:10.1016/j.aca.2016.02.009

Cited by 58 publications

(27 citation statements)

References 36 publications

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“…The analytical performance of the measured SPR sensor was comparable with other sensors in earlier reports. A Fe 3 O 4 @Au SERS substrate has been applied to detect the 16 EPA priority PAHs, the detection limit for BaP is 5 nmol·L −1 [25]. The BaP detection limit of a SPR immunosensor by employing a self-assembled mixed monolayer presenting BaP head groups was 50 ppt (about 0.2 nmol·L −1 ) [26].…”

Section: Resultsmentioning

confidence: 99%

Nanoporous Gold Films Prepared by a Combination of Sputtering and Dealloying for Trace Detection of Benzo[a]pyrene Based on Surface Plasmon Resonance Spectroscopy

Wang

Wan

et al. 2017

Sensors

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A wavelength-interrogated surface plasmon resonance (SPR) sensor based on a nanoporous gold (NPG) film has been fabricated for the sensitive detection of trace quantities of benzo[a]pyrene (BaP) in water. The large-area uniform NPG film was prepared by a two-step process that includes sputtering deposition of a 60-nm-thick AuAg alloy film on a glass substrate and chemical dealloying of the alloy film in nitric acid. For SPR sensor applications, the NPG film plays the dual roles of analyte enrichment and supporting surface plasmon waves, which leads to sensitivity enhancement. In this work, the as-prepared NPG film was first modified with 1-dodecanethiol molecules to make the film hydrophobic so as to improve BaP enrichment from water via hydrophobic interactions. The SPR sensor with the hydrophobic NPG film enables one to detect BaP at concentrations as low as 1 nmol·L−1. In response to this concentration of BaP the sensor produced a resonance-wavelength shift of ΔλR = 2.22 nm. After the NPG film was functionalized with mouse monoclonal IgG1 that is the antibody against BaP, the sensor’s sensitivity was further improved and the BaP detection limit decreased further down to 5 pmol·L−1 (the corresponding ΔλR = 1.77 nm). In contrast, the conventional SPR sensor with an antibody-functionalized dense gold film can give a response of merely ΔλR = 0.9 nm for 100 pmol·L−1 BaP.

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Section: Resultsmentioning

confidence: 99%

Nanoporous Gold Films Prepared by a Combination of Sputtering and Dealloying for Trace Detection of Benzo[a]pyrene Based on Surface Plasmon Resonance Spectroscopy

Wang

Wan

et al. 2017

Sensors

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“…Standard PAH analyses are mainly focused on bench-top instruments, including chromatographic, spectroscopic and immunoanalytical techniques [6][7][8][9][10]. These techniques usually require some pre-concentration and extraction procedures, hindering their integration for in-field analysis.…”

Section: Introductionmentioning

confidence: 99%

Study of carbon nanotube-rich impedimetric recognition electrode for ultra-low determination of polycyclic aromatic hydrocarbons in water

et al. 2018

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Carbon nanotubes (CNTs) have been studied as an electrochemical recognition element for the impedimetric determination of priority polycyclic aromatic hydrocarbons (PAHs) in water, using hexocyanoferrate as a redox probe. For this goal, an indium tin oxide (ITO) electrode functionalized with a silane-based self-assembled monolayer carrying CNTs has been engineered. The electroanalytical method, which is similar to an antibody-antigen assay, is straightforward and exploits the high CNT-PAH affinity obtained via π-interactions. After optimizing the experimental conditions, the resulting CNT-based impedimetric recognition platform exhibits ultra-low detection limits (1.75 ± 0.04 ng·L) for the sum of PAHs tested, which was also validated by using a certified reference PAH mixture. Graphical abstract Schematic of an indium-tin-oxide (ITO) electrode functionalized with a silane-based self-assembled monolayer carrying carbon nanotubes (CNTs) as a recognition platform for the ultra-low determination of total polycyclic aromatic hydrocarbons (PAHs) in water via π-interactions using Electrochemical Impedance Spectroscopy (EIS).

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“…Although several printed compendia of Raman spectra and characteristic frequencies are available (Nakamoto, 2008;Griffiths, 1991;Schrader, 1989;Dollish et al, 1974) and electronic versions are beginning to emerge, specialized libraries for particular problems are required to mitigate differences in instrumental functions. Based on our previous studies, PM 2.5 is composed of various chemical species, which can be divided into three main groups based on bulk analysis: (1) inorganic ions; (2) carbonaceous 10 species; and (3) trace elements Xu et al, 2017).…”

Section: Optimization Of Signal Identification For Pm 25mentioning

confidence: 99%

“…However, continued improvements of the feasibility and practicality of SERS spectroscopy are needed to probe the most important individual particles affecting the climate and human health (Ault and Axson, 2016) (Ofner et al, 2015). Our previous work focused on NP design and fabrication (Sun et al, 2016b) for SERS detection of environmental pollution in solution, such as mercury ions (Sun et al, 2016a), hexavalent chromium (Lv et al, 2017), polycyclic aromatic hydrocarbons (Du et al, 2016), and polybrominated diphenyl ethers . 15…”

Section: Introduction 20mentioning

confidence: 99%

Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy

Sun

Duan

et al. 2017

Preprint

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Abstract. Fine particle associated with haze pollution threatens the health of more than 400 million people in China. It is therefore of great importance to thoroughly investigate and understand its composition. To determine the physicochemical 10 properties in atmospheric fine particles at the micrometer level, we described a sensitive and feasible surface-enhanced Raman scattering (SERS) method using Ag foil as a substrate. This novel method enhanced the Raman signal intensities up to 10,000 a.u. for ν(NO 3 -) in fine particles with an enhancement factor of at least 56. The SERS effect of Ag foil was further studied experimentally and theoretically and found to have an enhancement factor of the order of ~ 10 4 . Size-fractionated real particle samples with aerodynamic diameters of 0.4-2.5 µm were successfully collected on a heavy 15 haze day, allowing ready observation of morphology and identification of chemical components, such as soot, nitrates, and sulfates. These results suggest that the Ag foil based SERS technique can be effectively used to determine the microscopic characteristics of individual fine particles, which will help to understand haze formation mechanisms and formulate governance policies.

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Au nanoparticles grafted on Fe3O4 as effective SERS substrates for label-free detection of the 16 EPA priority polycyclic aromatic hydrocarbons

Cited by 58 publications

References 36 publications

Nanoporous Gold Films Prepared by a Combination of Sputtering and Dealloying for Trace Detection of Benzo[a]pyrene Based on Surface Plasmon Resonance Spectroscopy

Nanoporous Gold Films Prepared by a Combination of Sputtering and Dealloying for Trace Detection of Benzo[a]pyrene Based on Surface Plasmon Resonance Spectroscopy

Study of carbon nanotube-rich impedimetric recognition electrode for ultra-low determination of polycyclic aromatic hydrocarbons in water

Physicochemical analysis of individual atmospheric fine particles based on effective surface-enhanced Raman spectroscopy

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