Your colleague gives you a sample that are supposed to consist of Pt-Ni nanoparticles, TiO2 nanorod arrays, and SiO2 monolith plates (see right panel schematic). The bimetallic Pt-Ni nanoparticles are expected to decorate on the side surfaces of the aligned TiO2 nanorod arrays. These aligned TiO2 nanoarrays grew on the flat SiO2 monolith. Let's assume that the sizes of the Pt-Ni nanoparticles are > 10 nm. We further assume that you have access to a modern SEM that can produce a probe size as small as 1 nm with a current as high as 1 nA. You are not expected to damage/destroy the sample. Hint: keep your answers concise and to the point. TiO₂ Nanorods SiO, monolith a) What do you plan to do if your colleague wants to know if the Pt and Ni formed uniform alloy nanoparticles? (5 points) b) If your colleague wants to know the spatial distribution of the PtNi nanoparticles with respect to the TiO2 nanoarrays, how do you accomplish such a goal? (5 points) c) Based on the experimental results in a) and b) above, you determined that the nanoparticles are all uniform in composition and spatial distribution. What do you plan to do if your colleague wants to obtain meaningful size distributions of the alloy nanoparticles? (5 points)
Your colleague gives you a sample that are supposed to consist of Pt-Ni nanoparticles, TiO2 nanorod arrays, and SiO2 monolith plates (see right panel schematic). The bimetallic Pt-Ni nanoparticles are expected to decorate on the side surfaces of the aligned TiO2 nanorod arrays. These aligned TiO2 nanoarrays grew on the flat SiO2 monolith. Let's assume that the sizes of the Pt-Ni nanoparticles are > 10 nm. We further assume that you have access to a modern SEM that can produce a probe size as small as 1 nm with a current as high as 1 nA. You are not expected to damage/destroy the sample. Hint: keep your answers concise and to the point. TiO₂ Nanorods SiO, monolith a) What do you plan to do if your colleague wants to know if the Pt and Ni formed uniform alloy nanoparticles? (5 points) b) If your colleague wants to know the spatial distribution of the PtNi nanoparticles with respect to the TiO2 nanoarrays, how do you accomplish such a goal? (5 points) c) Based on the experimental results in a) and b) above, you determined that the nanoparticles are all uniform in composition and spatial distribution. What do you plan to do if your colleague wants to obtain meaningful size distributions of the alloy nanoparticles? (5 points)
Chapter4: Mass Spectrometry: Part Two: Fragmentation And Structural Analysis
Section: Chapter Questions
Problem 5P
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Transcribed Image Text:Your colleague gives you a sample that are supposed to consist of Pt-Ni
nanoparticles, TiO2 nanorod arrays, and SiO2 monolith plates (see right panel
schematic). The bimetallic Pt-Ni nanoparticles are expected to decorate on
the side surfaces of the aligned TiO2 nanorod arrays. These aligned TiO2
nanoarrays grew on the flat SiO2 monolith. Let's assume that the sizes of the
Pt-Ni nanoparticles are > 10 nm. We further assume that you have access to
a modern SEM that can produce a probe size as small as 1 nm with a current
as high as 1 nA. You are not expected to damage/destroy the sample. Hint:
keep your answers concise and to the point.
TiO₂ Nanorods
SiO, monolith
a) What do you plan to do if your colleague wants to know if the Pt and Ni formed uniform alloy
nanoparticles? (5 points)
b) If your colleague wants to know the spatial distribution of the PtNi nanoparticles with respect to
the TiO2 nanoarrays, how do you accomplish such a goal? (5 points)
c) Based on the experimental results in a) and b) above, you determined that the nanoparticles are
all uniform in composition and spatial distribution. What do you plan to do if your colleague
wants to obtain meaningful size distributions of the alloy nanoparticles? (5 points)
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