Synthesis of Metal Nanocrystals
Au Nanobipyramids(DOI: 10.1002/adom.201400505) (another ref on BP- templated synthesis)
- Seeds: H2O (9.625 mL) + TSC (0.01 M, 250 uL) + HAuCl4 (0.01 M, 125 uL) + NaBH4 (0.01 M, 150 uL, ice-cold) (left for 4hrs)
- Growth solutions: CTBAB (0.01 M, 28.5 mL) + HAuCl4 (0.01 M, 1.2 mL) + AgNO3 (0.01 M, 60 uL) + Ascorbic Acid (0.1 M, 402 uL)
- Growth solution + 1.2/0.9/0.6/0.45/0.3/0.18/0.12 mL TSC seeds, incubate in 65 oC oven for 6 hrs.
Au Nanospheres (details can be found in this publication)
- seed 1: CTAB (0.1 M, 9.75 mL) + HAuCl4 (0.01 M, 250 uL) + (under stirring) NaBH4 (0.01 M, 600 uL, ice-cold) (keep stirring for 3 hrs)
- seed 2: CTAB (0.1 M, 9.75 mL) + H2O (190 mL) + HAuCl4 (0.01 M, 4 mL) + Ascorbic Acid (0.1 M, 15 mL) + (under stirring) seed 1 (120 uL), left for 5-8 hrs
- polyhedron: CTAC (0.025 M, 300 mL) +seed 2 (1.5/4/9/30 mL) + Ascorbic Acid (0.1 M, 7.5 mL) + (under stirring) HAuCl4 (0.01 M, 15 mL), keep in 45 oC, 4.5 hrs. (polyhedron with diameter ~ 220/160/120/80 nm)
- polyhedron (220/160/120/80 nm, 300+ mL) + HAuCl4 (0.01 M, 2~3 mL)
Ref: Preparation of ultrasmooth, highly spherical monocrystalline gold particles
- seeds: CTAB (0.1 M, 9.75 mL) + HAuCl4 (0.01 M, 250 uL) + NaBH4 (0.01 M, 600 uL, ice-cold) (left for 2-4 hrs)
- Growth solutions: CTAB (0.1 M, 400 mL) + HAuCl4 (0.01 M, 20 mL) + AgNO3 (0.01 M, 4 mL) +HCl (5M, 2 g)+ Ascorbic Acid (0.1 M, 3.2 mL)
- Growth solution + 100 uL/900 uL/10 mL seeds (for NR-40/20/10), left overnight.
Ref:
- ultra thin/long Au nanorod & nanowires
- a newly developed method using binary surfactants (need CTAB and NaOL) (see attached recipe)
- long Au nanorod with LSPW 1100-1300 nm
- Facets control of gold nanorods
- Highly concentrated Au Nanorod preparation
Overgrowth of Au Nanorods
- adjust the pH of the Au NR solution to 2.9-3.1, using HCl/NaOH
- add Glutathione (GSH, 0.01 M, 20 uL) into the Au NR solution (2 mL) to make the concentration of GSH to be 100 uM
- left at room temperature for 2 hrs
- add different volume of growth solution (6,8,10,12,15 mL) into the above solution, left at room temperature for 5-6 hrs
- Growth solution: CTAB (0.1 M, 42.75 mL) + HAuCl4 (0.01 M, 1.8 mL) + AgNO3 (0.01 M, 270 uL) + Ascorbic Acid (0.1 M, 288 uL)
- Au NRs (as grown, 10 mL): wash once and disperse in H2O (10 mL)
- +mPEG-SH (MW = 5000, Rapp Polymere GmbH, [CH3O-PEG-SH]1 mL, 1 mM for the polymer); (1 mM = 0.05 g mPEG-SH in 10 g H2O)
- left in room temperature, undisturbed, for overnight
- wash once and disperse in H2O or ethanol (can be dispersed in various types of polar organic solvents, including ethanol,methanol,acetone, acetonitrile, DMF, DMSO and PBS)
- Au NRs (as grown, 20 mL, pH adjusted to 7~8): wash once and disperse in H2O (10 mL), +NaOH to adjust pH to ~9
- keep stirring at 45 degree C, add 60 uL 20% (volume %) TEOS in ethanol 3 times at a time interval of 90 min
- keep stirring at 45 degree C for another 2 hrs.
- wash once and disperse in DI H2O (pH~4, do not need to add acids) or ethanol
Au Nanorods@SiO2
- 7.5 mL Au NRs@mPEG-SH (obtained from 40 mL as grown Au NRs acqueous solution) ethanol solution
- +2.25 mL DI H2O
- +150 uL 30% NH3H2O
- +40 uL 20% (volume %) TEOS in ethanol, room temperature keep stirring or in ultrasonic bath for 90 min. (shell coated~4 nm)
- repeat (4) for 3 times. wash once and disperse in DI H2O (pH~4, do not need to add acids) or ethanol
- Au NRs (as grown, 1 mL): wash once and disperse in CTAC (80 mM, 1 mL)
- +AgNO3 (0.01 M, 100 uL) +Ascorbic Acid (0.1 M, 50 uL)
- left in 65 oC oven
Au Nanorods@Pd (discontinuous)
- seed: Au NRs (as grown, 1 mL): wash once and disperse in deionized water (1 mL)
- Growth solution: H2O (3 mL)+CTAC (25w%, 30 uL)+H2PdCl4 (0.01 M, X uL (X=20~100))+Ascorbic Acid (0.1M, 0.5X uL)
- add the seed solution into the growth solution and left at room temperature for 6 hrs.
Au Nanorods@Pd (continuous) (publication)
- seed: Au NRs (as grown, 1 mL): wash once and disperse in deionized water (1 mL)
- Growth solution: H2O (2 mL)+CTAB (0.1M, 1 mL)+H2PdCl4 (0.01 M, X uL (X=20~100))+Ascorbic Acid (0.1M, 0.5X uL)
- add the seed solution into the growth solution and left at room temperature for 8 hrs.
- seed: Au NRs (as grown, 1 mL): wash once and disperse in deionized water (1 mL)
- Growth solution: H2O (2 mL)+CTAB (0.1 M, 1 mL)+H2PtCl4 (0.03943 M, X uL (X=10~100))+Ascorbic Acid (0.1M, 2X uL)
- add the seed solution into the growth solution and left in 65 oC oven for 8 hrs.
Au Nanocrystals@TiO2 (ref)
- Wrapping Au nanocrystals with PSS (MW 70000, Sigma 527483):
- Wash 10 mL as-grown nanocrystal sample stabilized with CTAB/CTAC by centrifugation to remove the excess surfactant; redisperse the nanocrystals into water (10 mL).
- Glass flask: 10 mL H2O + 60 uL PSS (MW70000;30 wt%) = 2 g/L PSS solution
- (under vigorous stirring) add the metal nanocrystal solution (10 mL) dropwise to the PSS solution (2 g/L, 10 mL)
- PSS adsorption was allowed for at least 4 h at room temperature. After the excess PSS was removed by centrifugation (washed 2 times), the PSS-encapsulated metal nanocrystals were redispersed into water (200 uL).
- Growth of TiO2 shell
- Glass flask: 6 mL H2O + 300 uL TiCl3 (Sigma 14010, 12% in HCl, free HCl 5-10%)
- (under stirring) Drop Na2CO3 (1 M, 500 uL), right after that + Au NC@PSS
- Keep stirring for 30 min
- Wash 2 times, redisperse in 10 mL water
- Wrapping Au nanorod with PAA/PAH
ref: https://onlinelibrary.wiley.com/doi/full/10.1002/smll.200801546
Porous Au nanocrystals:
http://pubs.acs.org/doi/abs/10.1021/jz402795x
Micrometer Au plates/Au nanoplates:
- http://www.sciencedirect.com/science/article/pii/S0927775705009234
- http://www.nature.com/ncomms/journal/v1/n9/full/ncomms1143.html (modified from ref 1)
- http://pubs.acs.org/doi/abs/10.1021/jp311470t (2013)
- http://arxiv.org/abs/1507.01387 (2015, >20 um plates)
- Gold nanoplates with tunable size/thickness
cross sections VS coefficients:
Calculate the absorption/scattering/extinction cross sections of nanocrystals from their absorption/scattering/extinction coefficient, which can be measured and calculated from the Beer's Law.