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XPS and SIMS map thioglucose SAMs on gold
Thio-glucose binds gold through Au–S; flat films pack better than citrate AuNPs, and ToF-SIMS sees TG–MBP pocket fragments.
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What thiol ligand was assembled?
1-β-D-thio-glucose (TG) on Au films and nanoparticles.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
What S2p energy proves Au–S chemisorption?
Component at about 162 eV.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
What does the ~164 eV S2p component mean?
Unbound/weakly bound sulfur still on the surface.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
How much does film C–O intensity rise after TG?
About six-fold at 286.5 eV.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
What C1s component appears only with MBP?
C2 near 288.5 eV from peptide bonds.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
How were the AuNPs made?
Microwave Turkevich: HAuCl4 to 97 °C, then citrate, 15 nm target.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
How much unbound TG remains on NPs after dialysis?
About 30%.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
What citrate XPS change accompanies TG exchange?
Na 1s falls 22 to 12 at% while Au 4f rises 2 to 6 at%.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
Which SIMS masses mark TG–MBP pocket complexes?
358 and 375 u.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
Do NPs match film TG density?
No—lower TG density and weaker MBP interaction on nanoparticles.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified
Overnight TG concentration for films?
0.5 mM TG in 1:1 water/ethanol.
Source: Surface Analysis of Gold Nanoparticles Functionalized with Thiol-Modified Glucose SAMs for Biosensor Applications · DOI · quote verified