Cationic Silicon Nanocrystals with Colloidal Stability, pH‐Independent Positive Surface Charge and Size Tunable Photoluminescence in the Near‐Infrared to Red Spectral Range
Source abstract
Abstract
In this report, the synthesis of a novel class of cationic quaternary ammonium‐surface‐functionalized silicon nanocrystals (ncSi) using a novel and highly versatile terminal alkyl halide‐surface‐functionalized ncSi synthon is described. The distinctive features of these cationic ncSi include colloidal stability, pH‐independent positive surface charge, and size‐tunable photoluminescence (PL) in the biologically relevant near‐infrared‐to‐red spectral region. These cationic ncSi are characterized via a combination of high‐resolution scanning transmission electron microscopy with energy‐dispersive X‐ray analysis, Fourier transform infrared, X‐ray photoelectron, and photoluminescence spectroscopies, and zeta potential measurements.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Quantum Dots Synthesis And Properties · Silicon Nanostructures and Photoluminescence · Carbon and Quantum Dots Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3H6 Canada
UOW Electron Microscopy Centre University of Wollongong Wollongong New South Wales 2500 Australia
Department of Materials Science & Engineering University of Toronto 184 College Street, Suite 140 Toronto Ontario M5S 3E4 Canada
Funding
Australian Research Council
References (44)
Show source-provided references
1. 10.1126/science.281.5385.201310.1126/science.281.5385.2013 ↗
2. 10.1126/science.281.5385.201610.1126/science.281.5385.2016 ↗
3. 10.1038/nmeth.124810.1038/nmeth.1248 ↗
4. 10.1039/C2CS35392J10.1039/C2CS35392J ↗
5. 10.1007/s00109-004-0629-x10.1007/s00109-004-0629-x ↗
6. 10.1289/ehp.828410.1289/ehp.8284 ↗
7. 10.1038/nmat139010.1038/nmat1390 ↗
8. 10.1021/nl049243610.1021/nl0492436 ↗
9. 10.1002/smll.20080090310.1002/smll.200800903 ↗
10. 10.1021/nn402923410.1021/nn4029234 ↗
11. 10.1038/nbt99410.1038/nbt994 ↗
12. 10.1002/ppsc.20140018510.1002/ppsc.201400185 ↗
13. 10.1002/smll.20110084510.1002/smll.201100845 ↗
14. 10.1021/nn700319z10.1021/nn700319z ↗
15. 10.1021/nn101894510.1021/nn1018945 ↗
16. 10.1002/smll.20110262710.1002/smll.201102627 ↗
17. 10.1002/anie.20050125610.1002/anie.200501256 ↗
18. 10.1039/b902671a10.1039/b902671a ↗
19. 10.1088/0957-4484/23/29/29400610.1088/0957-4484/23/29/294006 ↗
20. 10.1039/c1nr10458f10.1039/c1nr10458f ↗
21. 10.1002/smll.20100082510.1002/smll.201000825 ↗
22. 10.1021/ja103738t10.1021/ja103738t ↗
23. 10.1021/ja076069p10.1021/ja076069p ↗
24. 10.1021/nn101016f10.1021/nn101016f ↗
25. 10.1021/jp510592j10.1021/jp510592j ↗
26. 10.1021/ja508103710.1021/ja5081037 ↗
27. 10.1039/b417648k10.1039/b417648k ↗
28. 10.1021/jp960806e10.1021/jp960806e ↗
29. 10.1021/ja010032210.1021/ja0100322 ↗
30. 10.1021/nn504109a10.1021/nn504109a ↗
31. 10.1063/1.137761910.1063/1.1377619 ↗
32. 10.1002/pssb.20140002610.1002/pssb.201400026 ↗
33. 10.1021/nl203619410.1021/nl2036194 ↗
34. 10.1021/nn302524k10.1021/nn302524k ↗
35. 10.1002/adma.20140355210.1002/adma.201403552 ↗
36. NIST XPS database V4.1 http://srdata.nist.gov/xps/
37. 10.1021/jp303002c10.1021/jp303002c ↗
38. 10.1116/1.149038110.1116/1.1490381 ↗
39. 10.1021/la102983c10.1021/la102983c ↗
40. 10.1088/1468-6996/15/1/01420710.1088/1468-6996/15/1/014207 ↗
41. 10.1021/jp200116a10.1021/jp200116a ↗
42. 10.1146/annurev.matsci.30.1.54510.1146/annurev.matsci.30.1.545 ↗
43. While the spectral linewidth would be a useful indicator of dispersity in finely separated fractions samples in this work were separated into few fractions to retain yield for characterization purposes. Consequently the linewidths suffered from averaging effects caused by higher AQY particles and broadening due to surface oxidation and ligands. Therefore the linewidth (or full‐width at half max) is a less reliable indicator of population size or dispersity than AQY.
44. 10.1126/science.112512410.1126/science.1125124 ↗