| Full text | |
| Author(s): |
Fong, Darryl
[1, 2]
;
Luo, Shao-Xiong
[1, 2]
;
Andre, Rafaela S.
[1, 3, 2]
;
Swager, Timothy M.
[1, 2]
Total Authors: 4
|
| Affiliation: | [1] MIT, Dept Chem, Cambridge, MA 02139 - USA
[2] MIT, Inst Soldier Nanotechnol, 77 Massachusetts Ave, Cambridge, MA 02139 - USA
[3] Embrapa Instrumentacao, Nanotechnol Natl Lab Agr LNNA, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | ACS CENTRAL SCIENCE; v. 6, n. 4, p. 507-512, APR 22 2020. |
| Web of Science Citations: | 2 |
| Abstract | |
Ethylene is a dynamic plant hormone, and its temporal monitoring can be used to glean insight into plant health and status. However, the real-time distributed detection of ethylene at trace levels under ambient conditions remains a challenge. We report a single-walled carbon nanotube-based chemiresistor catalyst combination that can detect ppb levels of ethylene in air. Cycling between Pd(II) and Pd(0) via Wacker oxidation with a nitrite cocatalyst imparts response discrimination driven by the chemoselectivity of the chemical transformation. Sensitivity is controlled by a combination of the chemical reaction efficiency and the n-doping strength of the Pd(0) species generated in situ. The covalent functionalization of the carbon nanotube sidewall with pyridyl ligands drastically improves the device sensitivity via enhanced n-doping. The utility of this ethylene sensor is demonstrated in the monitoring of senescence in red carnations and purple lisianthus flowers. (AU) | |
| FAPESP's process: | 19/04154-9 - Free-standing ceramic nanofibers as sensitive layer in integrated sensor systems for gas detection |
| Grantee: | Rafaela da Silveira Andre |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |