Abstract
Size and shape distributions of gold nanorod samples are critical to their physico-chemical properties, especially their longitudinal surface plasmon resonance. This interlaboratory comparison study developed methods for measuring and evaluating size and shape distributions for gold nanorod samples using transmission electron microscopy (TEM) images. The objective was to determine whether two different samples, which had different performance attributes in their application, were different with respect to their size and/or shape descriptor distributions. Touching particles in the captured images were identified using a ruggedness shape descriptor. Nanorods could be distinguished from nanocubes using an elongational shape descriptor. A non-parametric statistical test showed that cumulative distributions of an elongational shape descriptor, that is, the aspect ratio, were statistically different between the two samples for all laboratories. While the scale parameters of size and shape distributions were similar for both samples, the width parameters of size and shape distributions were statistically different. This protocol fulfills an important need for a standardized approach to measure gold nanorod size and shape distributions for applications in which quantitative measurements and comparisons are important. Furthermore, the validated protocol workflow can be automated, thus providing consistent and rapid measurements of nanorod size and shape distributions for researchers, regulatory agencies, and industry.
| Original language | English |
|---|---|
| Pages (from-to) | 254-267 |
| Number of pages | 14 |
| Journal | Metrologia |
| Volume | 55 |
| Issue number | 2 |
| DOIs | |
| State | Published - Feb 28 2018 |
Bibliographical note
Funding Information:The authors thank Toshiyuki Fujimoto and Naoyuki Taketoshi of AIST for their advice and counsel with respect to ISO/TC229 needs and requirements of this study. The authors also thank the following researchers at National Institute of Standards and Technology (NIST) for their useful critiques regarding this study: Angela Hight Walker and Jeff Fagan.
Funding Information:
The authors thank Toshiyuki Fujimoto and Naoyuki Take-toshi of AIST for their advice and counsel with respect to ISO/TC229 needs and requirements of this study. The authors also thank the following researchers at National Institute of Standards and Technology (NIST) for their useful critiques regarding this study: Angela Hight Walker and Jeff Fagan. The work by AIST was part of the research program of ‘strategic international standardization acceleration projects’ supported by the Ministry of Economy, Trade, and Industry of Japan. The work by KRISS was part of the Nano Material Technology Development Program (2014M3A7B6020163) of Ministry of Science, ICT, and Future Planning/National Research Foundation (MSIP/NRF). The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the US National Institute for Occupational Safety and Health.
Publisher Copyright:
© 2018 BIPM & IOP Publishing Ltd.
Keywords
- gold nanorod
- shape distribution
- size distribution
- transmission electron microscopy
ASJC Scopus subject areas
- Engineering (all)