scholarly journals Raman spectroscopy as a tool to investigate the structure and electronic properties of carbon-atom wires

2015 ◽  
Vol 6 ◽  
pp. 480-491 ◽  
Author(s):  
Alberto Milani ◽  
Matteo Tommasini ◽  
Valeria Russo ◽  
Andrea Li Bassi ◽  
Andrea Lucotti ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Carbon Atom ◽  
Electronic Properties ◽  
Carbon Nanostructures ◽  
Short Review ◽  
Atomic Scale ◽  
Current Status ◽  
Wire Length ◽  
Molecular Group ◽  
Surface Enhanced Raman

Graphene, nanotubes and other carbon nanostructures have shown potential as candidates for advanced technological applications due to the different coordination of carbon atoms and to the possibility of π-conjugation. In this context, atomic-scale wires comprised of sp-hybridized carbon atoms represent ideal 1D systems to potentially downscale devices to the atomic level. Carbon-atom wires (CAWs) can be arranged in two possible structures: a sequence of double bonds (cumulenes), resulting in a 1D metal, or an alternating sequence of single–triple bonds (polyynes), expected to show semiconducting properties. The electronic and optical properties of CAWs can be finely tuned by controlling the wire length (i.e., the number of carbon atoms) and the type of termination (e.g., atom, molecular group or nanostructure). Although linear, sp-hybridized carbon systems are still considered elusive and unstable materials, a number of nanostructures consisting of sp-carbon wires have been produced and characterized to date. In this short review, we present the main CAW synthesis techniques and stabilization strategies and we discuss the current status of the understanding of their structural, electronic and vibrational properties with particular attention to how these properties are related to one another. We focus on the use of vibrational spectroscopy to provide information on the structural and electronic properties of the system (e.g., determination of wire length). Moreover, by employing Raman spectroscopy and surface enhanced Raman scattering in combination with the support of first principles calculations, we show that a detailed understanding of the charge transfer between CAWs and metal nanoparticles may open the possibility to tune the electronic structure from alternating to equalized bonds.

scholarly journals Raman spectroscopy as a tool to investigate the structure and electronic properties of carbon-atom wires

nano Online ◽  
2016 ◽  
Author(s):  
Alberto Milani ◽  
Matteo Tommasini ◽  
Valeria Russo ◽  
Andrea Li Bassi ◽  
Andrea Lucotti ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Carbon Atom ◽  
Electronic Properties

scholarly journals Ultrahigh sensitive Raman spectroscopy for subnanoscience: Direct observation of tin oxide clusters

2019 ◽  
Vol 5 (12) ◽  
pp. eaax6455 ◽  
Author(s):  
Akiyoshi Kuzume ◽  
Miyu Ozawa ◽  
Yuansen Tang ◽  
Yuki Yamada ◽  
Naoki Haruta ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Tin Oxide ◽  
Density Functional ◽  
Rational Design ◽  
High Sensitivity ◽  
Density Functional Theory Calculations ◽  
Surface Enhanced Raman Spectroscopy ◽  
Atomic Scale ◽  
Practical Applications ◽  
Surface Enhanced Raman

Subnanometric metal clusters exhibit anomalous catalytic activity, suggesting innovative applications as next-generation materials, although identifying and characterizing these subnanomaterials in atomic detail remains a substantial challenge because of the severely weak signal intensity for the conventional analytical methods. Here, we report a subnanosensitive vibrational technique established based on the surface-enhanced Raman spectroscopy, demonstrating the first-ever detailed vibrational characterization of subnanomaterials. Furthermore, combining with density functional theory calculations, we reveal that inherent surface structures of the tin oxide subnanoclusters determine the size-specific spectral and catalytic characteristics of these clusters. The high-sensitivity characterization methodology elaborated here can provide a comprehensive understanding of the chemical and structural natures of subnanomaterials, which facilitate the rational design of subnanomaterials on the atomic scale for practical applications, such as in catalysts, biosensors, and electronics.

scholarly journals Perspective of Future SERS Clinical Application Based on Current Status of Raman Spectroscopy Clinical Trials

2021 ◽  
Vol 9 ◽  
Author(s):  
Xi Xi ◽  
Chongyang Liang
Keyword(s):  
Raman Spectroscopy ◽  
Clinical Trials ◽  
Current Status ◽  
Biomedical Analysis ◽  
Raman Scattering Spectroscopy ◽  
Promising Tool ◽  
Accurate Design ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Ultrahigh Sensitivity

Raman spectroscopy has emerged as a promising tool in biomedical analysis and clinical diagnosis. The development of surface-enhanced Raman scattering spectroscopy (SERS) improved the detection limit with ultrahigh sensitivity and simplicity. More and more Raman spectroscopy clinical trials (R-PCT) have been conducted recently. However, there is a lack of an up-to-date review summarizing the current status of Raman clinical trials performed until now. Hence, the clinical trials for Raman were retrieved from the International Clinical Trials Registration Platform. We summarized the clinical characteristics of 55 registered Raman spectroscopy clinical trials (R-RSCTs) and 44 published Raman spectroscopy clinical trials (P-RSCTs). This review could assist researchers and clinicians to understand the current status of Raman spectroscopy clinical research and perhaps could benefit the reasonable and accurate design of future SERS studies.

scholarly journals CARBON ATOMIC WIRES: FROM STARS TO NANOTECHNOLOGY

2012 ◽  
Author(s):  
Carlo S. Casari
Keyword(s):  
Electronic Properties ◽  
Functional Properties ◽  
Vibrational Spectroscopy ◽  
Applied Research ◽  
Wire Length ◽  
Size Dependent ◽  
Atomic Wires ◽  
Molecular Group ◽  
The Status ◽  
Novel Devices

Carbon can produce a wide variety of systems and nanostructures with different dimensionality as exemplified by fullerenes, nanotubes and graphene, all with peculiar properties of great interest for fundamental and applied research. In this framework sp-hybridized carbon atoms can arrange to form atomic wires with size dependent functional properties. The sp form of carbon has a long story passing through astrophysics and minerals found in meteor craters and, although still considered elusive and unstable, nowadays a number of nano-systems constituted by or containing sp-carbon wires have been produced and characterized. As graphene is considered the thinnest material (one-atom thick), carbon atomic wires represent true 1-dimensional systems (one- atom diameter) with a great potential for nanoscience and nanotechnology. The status of research on carbon atomic wires is here discussed, starting from the description of ideal systems to real structures, showing that the properties can be tuned by controlling the wire length (i.e. number of carbon atoms) and termination (atom, molecular group or nanostructure). Synthesis techniques are presented as well as strategies to have stable wires. A particular attention will be given to the use of vibrational spectroscopy to provide insight on the structure and electronic properties of these systems. Perspectives for novel devices based on the exploitation of the electronic properties of these systems are also discussed.

Surface enhanced Raman spectroscopy of carbon nanostructures

2006 ◽  
Vol 600 (18) ◽  
pp. 3723-3728 ◽  
Author(s):  
E. Perevedentseva ◽  
A. Karmenyan ◽  
P.-H. Chung ◽  
Y.-T. He ◽  
C.-L. Cheng
Keyword(s):  
Raman Spectroscopy ◽  
Carbon Nanostructures ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

scholarly journals Diagnosing clean margins through Raman spectroscopy in human and animal mammary tumour surgery: a short review

2016 ◽  
Vol 6 (6) ◽  
pp. 20160067 ◽  
Author(s):  
I. A. Birtoiu ◽  
C. Rizea ◽  
D. Togoe ◽  
R. M. Munteanu ◽  
C. Micsa ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Raman Spectroscopy ◽  
Near Infrared ◽  
Research Effort ◽  
Short Review ◽  
Surface Enhanced Raman Spectroscopy ◽  
Diagnostic Tools ◽  
Optical Responses ◽  
Surface Enhanced Raman ◽  
Infrared Spectral

Breast cancer frequency in human and other mammal female populations has worryingly increased lately. The acute necessity for taxonomy of the aetiological factors along with seeking for new diagnostic tools and therapy procedures aimed at reducing mortality have yielded in an intense research effort worldwide. Surgery is a regular method to counteract extensive development of breast cancer and prevent metastases provided that negative surgical margins are achieved. This highly technical challenge requires fast, extremely sensitive and selective discrimination between malignant and benign tissues even down to molecular level. The particular advantages of Raman spectroscopy, such as high chemical specificity, and the ability to measure raw samples and optical responses in the visible or near-infrared spectral range, have recently recommended it as a means with elevated potential in precise diagnostic in oncology surgery. This review spans mainly the latter 10 years of exceptional efforts of scientists implementing Raman spectroscopy as a nearly real-time diagnostic tool for clean margins assessment in mastectomy and lumpectomy. Although greatly contributing to medical discoveries for the wealth of humanity, animals as patients have benefitted less from advances in surgery diagnostic using Raman spectroscopy. This work also dedicates a few lines to applications of surface enhanced Raman spectroscopy in veterinary oncological surgery.

Bacterial detection and differentiation via direct volatile organic compound sensing with surface enhanced Raman spectroscopy

2017 ◽  
Author(s):  
Caitlin S. DeJong ◽  
David I. Wang ◽  
Aleksandr Polyakov ◽  
Anita Rogacs ◽  
Steven J. Simske ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Bacterial Infections ◽  
Direct Detection ◽  
Point Of Care ◽  
Surface Enhanced Raman Spectroscopy ◽  
E Coli ◽  
Recent Emergence ◽  
Surface Enhanced ◽  
Volatile Organic ◽  
Surface Enhanced Raman

Through the direct detection of bacterial volatile organic compounds (VOCs), via surface enhanced Raman spectroscopy (SERS), we report here a reconfigurable assay for the identification and monitoring of bacteria. We demonstrate differentiation between highly clinically relevant organisms: <i>Escherichia coli</i>, <i>Enterobacter cloacae</i>, and <i>Serratia marcescens</i>. This is the first differentiation of bacteria via SERS of bacterial VOC signatures. The assay also detected as few as 10 CFU/ml of <i>E. coli</i> in under 12 hrs, and detected <i>E. coli</i> from whole human blood and human urine in 16 hrs at clinically relevant concentrations of 10<sup>3</sup> CFU/ml and 10<sup>4</sup> CFU/ml, respectively. In addition, the recent emergence of portable Raman spectrometers uniquely allows SERS to bring VOC detection to point-of-care settings for diagnosing bacterial infections.

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