Zinc oxide/silver nanoarrays as reusable SERS substrates with controllable ‘hot-spots’ for highly reproducible molecular sensing

Kandjani, Ahmad Esmaielzadeh; Mohammadtaheri, Mahsa; Thakkar, Akshi; Bhargava, Suresh K.; Bansal, Vipul

doi:10.1016/j.jcis.2014.09.017

Cited by 101 publications

(78 citation statements)

References 43 publications

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“…The main peak for Ag 3d 5/2 appearing at the binding energy of 368.4 eV corresponds to the elemental Ag 0 form. 65 Au 4f 7/2 core level appeared at the binding energy of 84.4 eV which confirmed that the Au_MNM surface contained only Au 0 . 62 After mercury sensing experiments, no significant shifting of Ag 3d and Au 4f core levels was observed.…”

Section: Sensor Performancesupporting

confidence: 55%

Nanosphere Monolayer on a Transducer for Enhanced Detection of Gaseous Heavy Metal

Sabri

Kandjani

Ippolito

et al. 2015

ACS Appl. Mater. Interfaces

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This study reports for the first time that polystyrene monodispersed nanosphere monolayer (PS-MNM) based Au (Au-MNM) and Ag (Ag-MNM) nanostructures deposited on quartz crystal microbalance (QCM) transducers can be used for nonoptical based chemical sensing with extremely high sensitivity and selectivity. This was demonstrated by exposing the Au-MNM and Ag-MNM based QCMs to low concentrations of Hg(0) vapor in the presence interferent gas species (i.e., H2O, NH3, volatile organics, etc.) at operating temperatures of 30 and 75 °C. At 30 °C, the Au-MNM and Ag-MNM based QCMs showed ∼16 and ∼20 times higher response magnitude toward Hg(0) vapor concentration of 3.26 mg/m(3) (364 parts per billion by volume (ppbv)) relative to their unmodified control counterparts, respectively. The results indicated that the extremely high sensitivity was not due to the increased surface area (only 4.62 times increase) but due to their long-range interspatial order and high number of surface defect formation which are selectively active toward Hg(0) vapor sorption. The Au-MNM and Ag-MNM also had more than an order of magnitude lower detection limits (<3 ppbv) toward Hg(0) vapor compared to their unmodified control counterparts (>30 ppbv). When the operating temperature was increased from 30 to 75 °C, it was found that the sensors exhibited lower drift, better accuracy, and better selectivity toward Hg(0) vapor but at the compromise of higher detection limits. The high repeatability (84%), accuracy (97%), and stability of Au-MNM in particular make it practical to potentially be used as nonspectroscopic based Hg(0) vapor sensor in many industries either as mercury emission monitoring or as part of a mercury control feedback system.

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Section: Sensor Performancesupporting

confidence: 55%

Nanosphere Monolayer on a Transducer for Enhanced Detection of Gaseous Heavy Metal

Sabri

Kandjani

Ippolito

et al. 2015

ACS Appl. Mater. Interfaces

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“…It provides a greatly enhanced Raman signal from a Raman-active analyte adsorbed onto metal nanostructure surfaces [174,175,176,177,178,179]. This enhancement factor strongly relies on the size, shape, and composition of the metallic nanostructure and nature of the molecular analyte [180].…”

Section: Graphene–gold Nanoparticle Hybrid For Biosensing and Bioimentioning

confidence: 99%

Graphene–Gold Nanoparticles Hybrid—Synthesis, Functionalization, and Application in a Electrochemical and Surface-Enhanced Raman Scattering Biosensor

et al. 2016

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Graphene is a single-atom-thick two-dimensional carbon nanosheet with outstanding chemical, electrical, material, optical, and physical properties due to its large surface area, high electron mobility, thermal conductivity, and stability. These extraordinary features of graphene make it a key component for different applications in the biosensing and imaging arena. However, the use of graphene alone is correlated with certain limitations, such as irreversible self-agglomerations, less colloidal stability, poor reliability/repeatability, and non-specificity. The addition of gold nanostructures (AuNS) with graphene produces the graphene–AuNS hybrid nanocomposite which minimizes the limitations as well as providing additional synergistic properties, that is, higher effective surface area, catalytic activity, electrical conductivity, water solubility, and biocompatibility. This review focuses on the fundamental features of graphene, the multidimensional synthesis, and multipurpose applications of graphene–Au nanocomposites. The paper highlights the graphene–gold nanoparticle (AuNP) as the platform substrate for the fabrication of electrochemical and surface-enhanced Raman scattering (SERS)-based biosensors in diverse applications as well as SERS-directed bio-imaging, which is considered as an emerging sector for monitoring stem cell differentiation, and detection and treatment of cancer.

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“…Surface-enhanced Raman scattering (SERS), based on the magnitude of the electromagnetic field around a roughened gold or silver surface [10], is a promising technique for chemical sensing [11,12], bio-sensing [13,14] and bioimaging [15,16] due to its high sensitivity and noninvasiveness [17]. To date, there are some researches for the detection of Pb 2+ using SERS probes [18][19][20][21] [20].…”

Section: Introductionmentioning

confidence: 99%

In situ regulation nanoarchitecture of Au nanoparticles/reduced graphene oxide colloid for sensitive and selective SERS detection of lead ions

Zhao

Zhang

et al. 2016

Journal of Colloid and Interface Science

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Zinc oxide/silver nanoarrays as reusable SERS substrates with controllable ‘hot-spots’ for highly reproducible molecular sensing

Cited by 101 publications

References 43 publications

Nanosphere Monolayer on a Transducer for Enhanced Detection of Gaseous Heavy Metal

Nanosphere Monolayer on a Transducer for Enhanced Detection of Gaseous Heavy Metal

Graphene–Gold Nanoparticles Hybrid—Synthesis, Functionalization, and Application in a Electrochemical and Surface-Enhanced Raman Scattering Biosensor

In situ regulation nanoarchitecture of Au nanoparticles/reduced graphene oxide colloid for sensitive and selective SERS detection of lead ions

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