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| Content Provider | PubMed Central |
|---|---|
| Author | Shen, Mei Ishimatsu, Ryoichi Kim, Jiyeon Amemiya, Shigeru |
| Abstract | Here, we report on the unprecedentedly high-resolution imaging of ion transport through single nanopores by scanning electrochemical microscopy (SECM). The quantitative SECM image of single nanopores allows for the determination of their structural properties, including their density, shape, and size, which are essential for understanding the permeability of the entire nanoporous membrane. Nanoscale spatial resolution was achieved by scanning a 17 nm-radius pipet tip at a distance down to 1.3 nm from a highly porous nanocrystalline silicon membrane in order to obtain the peak current response controlled by the nanopore-mediated diffusional transport of tetrabutylammonium to the nanopipet-supported liquid/liquid interface. A 280 nm × 500 nm image resolved 13 nanopores, which corresponds to a high density of 93 pores/µm2. A finite element simulation of the SECM image was performed to quantitatively assess the spatial resolution limited by the tip diameter in resolving two adjacent pores, and to determine the actual size of a nanopore, which was approximated as an elliptic cylinder with a depth of 30 nm and major and minor axes of 53 and 41 nm, respectively. These structural parameters are consistent with those determined by TEM, which thereby confirms the reliability of quantitative SECM imaging at the nanoscale level. |
| Related Links | http://dx.doi.org/10.1021/ja3023785 |
| Starting Page | 9856 |
| File Format | |
| ISSN | 15205126 |
| e-ISSN | 15205126 |
| Journal | Journal of the American Chemical Society |
| Issue Number | 24 |
| Volume Number | 134 |
| Language | English |
| Publisher Date | 2012-06-20 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Colloid and Surface Chemistry Biochemistry Catalysis |
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