A Spectroscopic Study of Mercury Vapor Adsorption on Gold Nanoparticle Films

Morris, Todd A.; Kloepper, Kathy; Wilson, Scott; Szulczewski, Greg

doi:10.1006/jcis.2002.8554

Cited by 38 publications

(32 citation statements)

References 31 publications

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“…The literature data concerning absorption bands of gold in the UV-visible range have only one unified point -the absorption in the range 500-600 nm belongs to plasmon resonance in gold metallic particles [22][23][24][25][26]. The peaks with maxima in the region 230-380 nm may be attributed to charge-transfer transitions in Au(I) chlorides, Au(III) chlorides [25,26] or gold neutral and charged clusters [18][19][20].…”

Section: Resultsmentioning

confidence: 98%

Catalytically active gold clusters and nanoparticles for CO oxidation

et al. 2007

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Section: Resultsmentioning

confidence: 98%

Catalytically active gold clusters and nanoparticles for CO oxidation

et al. 2007

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“…Short-term memory effects occur when Hg is insufficiently flushed from the sorbent during desorption and can be addressed through the use of properly tuned desorption cycles that maximize the recovery of sorbed Hg by ensuring flow rate, desorption temperature, and duration are sufficient to flush all Hg from the sorbent Luo et al, 2010;Skov et al, 2007). Long-term memory effects occur when Hg, especially in its oxidized forms Morris et al, 2002;Nowakowski et al, 1997), diffuses from surface sorption sites into the bulk material Dumarey et al, 1985;Luo et al, 2010). Brown et al (2011) proposed that the diffusion of Hg into the bulk material may actually be facilitated by thermal desorption and not occur during sampling.…”

Section: Do the Sorbents Used In Existing Samplers Have A Sufficientlmentioning

confidence: 99%

Passive air sampling of gaseous elemental mercury: a critical review

et al. 2016

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Abstract. Because gaseous elemental mercury (GEM) is distributed globally through the atmosphere, reliable means of measuring its concentrations in air are important. Passive air samplers (PASs), designed to be cheap, simple to operate, and to work without electricity, could provide an alternative to established active sampling techniques in applications such as (1) long-term monitoring of atmospheric GEM levels in remote regions and in developing countries, (2) atmospheric mercury source identification and characterization through finely resolved spatial mapping, and (3) the recording of personal exposure to GEM. An effective GEM PAS requires a tightly constrained sampling rate, a large and stable uptake capacity, and a sensitive analytical technique. None of the GEM PASs developed to date achieve levels of accuracy and precision sufficient for the reliable determination of background concentrations over extended deployments. This is due to (1) sampling rates that vary due to meteorological factors and manufacturing inconsistencies, and/or (2) an often low, irreproducible and/or unstable uptake capacity of the employed sorbents. While we identify shortcomings of existing GEM PAS, we also reveal potential routes to overcome those difficulties. Activated carbon and nanostructured metal surfaces hold promise as effective sorbents. Sampler designs incorporating diffusive barriers should be able to notably reduce the influence of wind on sampling rates.

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“…Morris et al exposed films of gold nanospheres of varying size to saturated mercury vapor in room temperature air. 12 They found that the shifts in LSPR at saturation were greater for smaller particles. Our previous work observing individual gold nanorods’ spectral response to μg/m 3 concentrations of mercury in air found that the sensitivity was not dependent on size directly, but proportional to surface-area-to-volume ratio.…”

Section: Resultsmentioning

confidence: 99%

“…13 We selected ~5 nm spheres, because they have the largest surface-area-to-volume ratio while still having an observable peak in absorbance for an assembled film. 12 A schematic of the sensor is shown in Figure 1. Spheres are the minimum surface-area-to-volume ratio shape but they can be synthesized in much smaller sizes than the more complicated geometries.…”

Section: Resultsmentioning

confidence: 99%

Gold Nanoparticle Films As Sensitive and Reusable Elemental Mercury Sensors

James

Lucas

Koshland

2012

Environ. Sci. Technol.

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We demonstrate the utility of gold nanoparticles (AuNPs) as the basis of a stand-alone, inexpensive, and sensitive mercury monitor. Gold nanoparticles absorb visible light due to localized surface plasmon resonance (LSPR), and the absorbance changes when mercury combines with the gold nanoparticles. The sensitivity of the peak absorbance is proportional to the surface-area-to-volume ratio. We chose 5 nm spheres, because they have the largest surface-area-to-volume ratio while still having a peak absorption in the visible. The adsorption of 15 atoms of Hg causes a 1 nm shift in the LSPR wavelength of these particles. Assembled into a film using the Langmuir-Blodgett method, the AuNP LSPR can be tracked with a simple UV-Vis spectrometer. The rate of shift in the peak absorbance is linear with mercury concentrations from 1 to 825 μg /m 3 Hg air . Increasing the flow velocity (and mass transfer rate) increases the peak shift rate, making this system a viable method for direct ambient mercury vapor measurements. Regeneration of the sensing films, done by heating to 160°C, allows for repeatable measurements on the same film.

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A Spectroscopic Study of Mercury Vapor Adsorption on Gold Nanoparticle Films

Cited by 38 publications

References 31 publications

Catalytically active gold clusters and nanoparticles for CO oxidation

Catalytically active gold clusters and nanoparticles for CO oxidation

Passive air sampling of gaseous elemental mercury: a critical review

Gold Nanoparticle Films As Sensitive and Reusable Elemental Mercury Sensors

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