EXPRESS: Chemometric Evaluation of Ultraviolet–Visible (UV–Vis) Spectra for Characterization of Silver Nanowire Diameter and Yield

2019 ◽  
pp. 000370281985936
Author(s):  
Clifford S Todd ◽  
Xiaoyun Chen
Keyword(s):  
Silver Nanowire ◽  
Nanowire Diameter

Chemometric Evaluation of Ultraviolet–Visible (UV–Vis) Spectra for Characterization of Silver Nanowire Diameter and Yield

2019 ◽  
Vol 74 (2) ◽  
pp. 204-209
Author(s):  
Clifford S. Todd ◽  
Xiaoyun Chen
Keyword(s):  
Main Tool ◽  
Wire Diameter ◽  
Silver Nanowire ◽  
Diameter Distribution ◽  
Distribution Data ◽  
Data Set ◽  
Nanowire Diameter ◽  
Particle Yield ◽  
Vis Spectroscopy

The main tool used for routine screening of silver nanowire diameter and wire-to-particle yield is ultraviolet–visible (UV–Vis) spectroscopy. The normalized absorbance near 500 nm is generally taken to correlate with wire yield (lower absorbance means fewer particles and higher wire yield). The location of the UV–Vis peak near 375 nm is generally believed to correlate with wire diameter. These qualitative assessments are of unknown uncertainty. Improved microscopy-based analysis of wire diameter distribution and wire yield had recently been developed and were used to characterize synthesis products in parallel with UV–Vis data collection. Here we present results of leveraging this quantitative wire yield and diameter distribution data to quantitatively calibrate the UV–Vis methods for characterizing wire diameter and yield. Chemometric analysis was also applied to this UV–Vis data set and resulted in statistically significant models that can predict average wire diameter and wire/particle yield slightly better than the univariate method.

Statistically Rigorous Silver Nanowire Diameter Distribution Quantification by Automated Electron Microscopy and Image Analysis

2019 ◽  
Vol 25 (3) ◽  
pp. 630-638 ◽  
Author(s):  
Clifford S. Todd ◽  
William A. Heeschen ◽  
Peter Y. Eastman ◽  
Ellen C. Keene
Keyword(s):  
Image Analysis ◽  
Average Diameter ◽  
Silver Nanowire ◽  
Diameter Distribution ◽  
Nanowire Diameter ◽  
Microscope Imaging ◽  
Microscopy Method ◽  
Kinetics Of ◽  
Imaging Conditions ◽  
Insight Into

AbstractSilver nanowire (AgNW) diameters are typically characterized by manual measurement from high magnification electron microscope images. Measurement is monotonous and has potential ergonomic hazards. Because of this, statistics regarding wire diameter distribution can be poor, costly, and low-throughput. In addition, manual measurements are of unknown uncertainty and operator bias. In this paper we report an improved microscopy method for diameter and yield measurement of nanowires in terms of speed/automation and reduction of analyst variability. Each step in the process to generate these measurements was analyzed and optimized: microscope imaging conditions, sample preparation for imaging, image acquisition, image analysis, and data processing. With the resulting method, average diameter differences between samples of just a few nanometers can be confidently and statistically distinguished, allowing the identification of subtle incremental improvements in reactor processing conditions, and insight into nucleation and growth kinetics of AgNWs.

scholarly journals The dependence of silver nanowire stability on network composition and processing parameters

RSC Advances ◽  
2017 ◽  
Vol 7 (57) ◽  
pp. 35590-35597 ◽  
Author(s):  
Geoffrey Deignan ◽  
Irene A. Goldthorpe
Keyword(s):  
Silver Nanowires ◽  
Processing Parameters ◽  
Silver Nanowire ◽  
Nanowire Diameter ◽  
Network Composition

Variables such as nanowire diameter and density are found to have a significant effect on the degradation of silver nanowires.

Growth and Characterization of ZnO Nanowires

2003 ◽  
Vol 776 ◽  
Author(s):  
Jason B. Baxter ◽  
Ron E.M.W. Bessems ◽  
Eray S. Aydil
Keyword(s):  
Chemical Vapor ◽  
Zno Nanowires ◽  
Ultraviolet Region ◽  
Electromagnetic Spectrum ◽  
High Quality ◽  
Nanowire Diameter ◽  
Nanoparticle Catalysts ◽  
Near Ultraviolet ◽  
20 Nm

AbstractSingle crystal ZnO nanowires were grown by chemical vapor deposition using monodisperse 5 nm or 20 nm diameter gold nanoparticle catalysts to control the nanowire diameter and location. The nanowires reach several microns in length and grow only from the gold nanoparticles. The nanowires have narrowly dispersed diameters, albeit significantly larger than the diameter of the gold particles used for catalyzing the growth. The nanowires grow in the [ 0 1 10 ] or [ 1 1 10 ] directions normal to the lowest energy planes in ZnO. ZnO nanowires emit in the near ultraviolet region of the electromagnetic spectrum upon excitation with highenergy photons or electrons. Electron diffraction and absence of luminescence associated with oxygen vacancies indicate high quality crystalline ZnO nanowires. Cathodoluminescence e mission along the entire length of the wire is consistent with a lack of non-radiative recombination sites associated with defects, lending further support for the high quality of these nanowires.

scholarly journals Efficient Capture and Raman Analysis of Circulating Tumor Cells by Nano-Undulated AgNPs-rGO Composite SERS Substrates

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5089
Author(s):  
Jong-Eun Park ◽  
Nuri Oh ◽  
Hyeono Nam ◽  
Ji-Ho Park ◽  
Sanha Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Cancer Cells ◽  
Tumor Cells ◽  
Circulating Tumor Cells ◽  
Electric Fields ◽  
Indium Tin Oxide ◽  
Hot Spot ◽  
Silver Nanowire ◽  
Sers Substrate

The analysis of circulating tumor cells (CTCs) in the peripheral blood of cancer patients is critical in clinical research for further investigation of tumor progression and metastasis. In this study, we present a novel surface-enhanced Raman scattering (SERS) substrate for the efficient capture and characterization of cancer cells using silver nanoparticles-reduced graphene oxide (AgNPs-rGO) composites. A pulsed laser reduction of silver nanowire-graphene oxide (AgNW-GO) mixture films induces hot-spot formations among AgNPs and artificial biointerfaces consisting of rGOs. We also use in situ electric field-assisted fabrication methods to enhance the roughness of the SERS substrate. The AgNW-GO mixture films, well suited for the proposed process due to its inherent electrophoretic motion, is adjusted between indium tin oxide (ITO) transparent electrodes and the nano-undulated surface is generated by applying direct-current (DC) electric fields during the laser process. As a result, MCF7 breast cancer cells are efficiently captured on the AgNPs-rGO substrates, about four times higher than the AgNWs-GO films, and the captured living cells are successfully analyzed by SERS spectroscopy. Our newly designed bifunctional substrate can be applied as an effective system for the capture and characterization of CTCs.

SILICON NANOWIRES FORMATION IN CMOS COMPATIBLE MANNER

2006 ◽  
Vol 05 (04n05) ◽  
pp. 445-451 ◽  
Author(s):  
AJAY AGARWAL ◽  
N. BALASUBRAMANIAN ◽  
N. RANGANATHAN ◽  
R. KUMAR
Keyword(s):  
Silicon Nanowires ◽  
Silicon Nanowire ◽  
Electrical Characterization ◽  
Single Electron Transistor ◽  
Bulk Silicon ◽  
Nanowire Diameter ◽  
Section Shape ◽  
Medical Sensors ◽  
Cmos Compatible

We present CMOS compatible fabrication technique for silicon nanowire ( SiNW ) on bulk silicon wafers. Our method uses saw-tooth etch-profiles of fins followed by self-limiting oxidation to form vertically self-aligned horizontal SiNW down to 5 nm diameter. The concept of modifying the cross-section shape of SiNW from triangular to circular and the ability to achieve desired nanowire diameter are unique in this work. Nanowires formed by such technique can be utilized to realize several nanoelectronics devices like gate-all-around transistor, single-electron-transistor, etc.; NEMS and bio-medical sensors; all in a CMOS friendly manner. The physical and electrical characterization of the SiNW is also presented in this paper.

Electrical characterization of silver nanowire-graphene hybrid films from terahertz transmission and reflection measurements

2014 ◽  
Vol 105 (1) ◽  
pp. 011101 ◽  
Author(s):  
Ehsan Dadrasnia ◽  
Frédéric Garet ◽  
Dongmok Lee ◽  
Jean-Louis Coutaz ◽  
Seunghyun Baik ◽  
...  
Keyword(s):  
Electrical Characterization ◽  
Silver Nanowire ◽  
Hybrid Films ◽  
Terahertz Transmission ◽  
Transmission And Reflection
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