Portable Electrochemical Surface-Enhanced Raman Spectroscopy System for Routine Spectroelectrochemical Analysis

Robinson, Ashley M.; Harroun, Scott G.; Bergman, J. G.; Brosseau, Christa L.

doi:10.1021/ac2030078

Cited by 80 publications

(91 citation statements)

References 47 publications

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“…Despite these past studies, E‐SERS has, generally speaking, remained under explored when compared to the fast development of other aspects of PERS research. This lack of research has persisted despite electrochemical E‐SERS modulation capability of enhancing the SERS signal by over 10 times to detect environmentally or biomedically relevant molecules . The key reason for the slow development of E‐SERS in molecular detection is the complexity of the instrumental setup.…”

Section: Figurementioning

confidence: 99%

“…The key reason for the slow development of E‐SERS in molecular detection is the complexity of the instrumental setup. In E‐SERS setups, the SERS‐active substrates have to be, not only nanoscopically engineered but also electrically conductive, and the measurement needs to be performed in an electrochemical cell . These particular setup requirements, consequently, offset the E‐SERS signal enhancement advantages, making practical molecular detection situations enormously inconvenient especially since fast and on‐site operations are often required.…”

Section: Figurementioning

confidence: 99%

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Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Dai

Zhang

et al. 2017

Angewandte Chemie

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Electrochemically up‐regulated surface‐enhanced Raman spectroscopy (E‐SERS) effectively increases Raman signal intensities. However, the instrumental requirements and the conventional measurement conditions in an electrolyte cell have hampered its application in fast and on‐site detection. To circumvent the inconveniences of E‐SERS, we propose a self‐energizing substrate that provides electrical potential by converting film deformation from a finger press into stored electrical energy. The substrate combines an energy conversion film and a SERS‐active Ag nanowire layer. A composite film prepared from a piezoelectric polymer matrix and surface‐engineered rGO that simultaneously presents high permittivity and low dielectric loss is the key component herein. Using our substrate, increased E‐SERS signals up to 10 times from a variety of molecules were obtained in the open air. Various tests on real‐life sample surfaces demonstrated the potentials of the substrate in fast on‐site detection.

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Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Dai

Zhang

et al. 2017

Angewandte Chemie

View full text Add to dashboard Cite

show abstract

“…[13][14][15][16][17] Despite these past studies,E -SERS has,g enerally speaking, remained under explored when compared to the fast development of other aspects of PERS research. [19] Thekey reason for the slow development of E-SERS in molecular detection is the complexity of the instrumental setup.I nE -SERS setups,t he SERS-active substrates have to be,n ot only nanoscopically engineered but also electrically conductive,a nd the measurement needs to be performed in an electrochemical cell. [19] Thekey reason for the slow development of E-SERS in molecular detection is the complexity of the instrumental setup.I nE -SERS setups,t he SERS-active substrates have to be,n ot only nanoscopically engineered but also electrically conductive,a nd the measurement needs to be performed in an electrochemical cell.…”

mentioning

confidence: 99%

“…This lack of research has persisted despite electrochemical E-SERS modulation capability of enhancing the SERS signal by over 10 times [18] to detect environmentally or biomedically relevant molecules. [19] Thekey reason for the slow development of E-SERS in molecular detection is the complexity of the instrumental setup.I nE -SERS setups,t he SERS-active substrates have to be,n ot only nanoscopically engineered but also electrically conductive,a nd the measurement needs to be performed in an electrochemical cell. [18,19] These particular setup requirements,c onsequently,o ffset the E-SERS signal enhancement advantages,m aking practical molecular detection situations enormously inconvenient especially since fast and on-site operations are often required.…”

mentioning

confidence: 99%

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Dai

Zhang

et al. 2017

Angew Chem Int Ed

View full text Add to dashboard Cite

Electrochemically up-regulated surface-enhanced Raman spectroscopy (E-SERS) effectively increases Raman signal intensities. However, the instrumental requirements and the conventional measurement conditions in an electrolyte cell have hampered its application in fast and on-site detection. To circumvent the inconveniences of E-SERS, we propose a self-energizing substrate that provides electrical potential by converting film deformation from a finger press into stored electrical energy. The substrate combines an energy conversion film and a SERS-active Ag nanowire layer. A composite film prepared from a piezoelectric polymer matrix and surface-engineered rGO that simultaneously presents high permittivity and low dielectric loss is the key component herein. Using our substrate, increased E-SERS signals up to 10 times from a variety of molecules were obtained in the open air. Various tests on real-life sample surfaces demonstrated the potentials of the substrate in fast on-site detection.

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“…Additionally, surface-enhanced Raman scattering is also a possible solution in fabricating lightweight Raman spectroscopes (e.g., refs. 19,20). The enhanced Raman signal strength enables noncooled CCD camera/photodiode detectors to be implemented as signal receivers.…”

mentioning

confidence: 99%

Lightweight Raman spectroscope using time-correlated photon-counting detection

Meng

Petrov

Cheng

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Raman spectroscopy is an important tool in understanding chemical components of various materials. However, the excessive weight and energy consumption of a conventional CCD-based Raman spectrometer forbids its applications under extreme conditions, including unmanned aircraft vehicles (UAVs) and Mars/Moon rovers. In this article, we present a highly sensitive, shot-noise-limited, and ruggedized Raman signal acquisition using a time-correlated photon-counting system. Compared with conventional Raman spectrometers, over 95% weight, 65% energy consumption, and 70% cost could be removed through this design. This technique allows space-and UAV-based Raman spectrometers to robustly perform hyperspectral Raman acquisitions without excessive energy consumption. Comparing with other molecular-specific imaging techniques, Raman spectroscopy provides a label-free contrast mechanism, which is intrinsically induced by the molecules contained in the sample. Relying on internal properties of molecules, investigators can avoid complicated sample preparation processes and molecular-specific labeling, etc. In many imaging/sensing applications, Raman spectroscopy often provides superior molecular specificity, imaging speed, and spectral resolution, and is usually considered as an emerging imaging technique (8, 9). However, despite decades of intensive study, Raman spectroscopy is still not widely applicable in space-based detection systems including unmanned aircraft vehicles (UAVs) and Mars/Moon rovers. This is mainly due to two hurdles: the unacceptable heavy weight of conventional spectrometers, and the excessive energy consumption by the entire system, especially the CCD camera.In typical laboratory-based Raman spectroscope setups, a beam of light is focused onto the sample. The scattered photons are then collected by a condenser lens and sent into a spectrometer. A diffractive grating is usually used to induce a spatial dispersion of the Raman peaks into different wavelengths. A CCD camera is used as the detector. In this sense, a correspondence between the CCD pixel and Raman shift can be established, and the Raman peaks are recognized and recorded.However, when extending this approach to field circumstances (e.g., space-based vehicles or UAVs), several key limitations emerge. First, due to the tiny angular dispersion provided by diffractive gratings, a long optical propagation length is required to create sufficient spatial dispersion. This is usually not allowed in space-based vehicles. Moreover, this long propagation length, together with any possible moving parts contained in the grating-based spectrometers, is unable to tolerate excessive vibrations during the launching/landing process of a space-based vehicle. Furthermore, the excessive energy consumption for the CCD cameras, especially for the cooling process, is usually not affordable by UAVs or spacebased vehicles/rovers. Finally, the weight of the spectrometer is also a problem (10-12).To overcome these difficulties, investigators invented and used several differe...

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Portable Electrochemical Surface-Enhanced Raman Spectroscopy System for Routine Spectroelectrochemical Analysis

Cited by 80 publications

References 47 publications

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Lightweight Raman spectroscope using time-correlated photon-counting detection

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