Discussion
Consider the following statements about nanomaterials.
1. Surface to volume ratio rises as particle size falls 2. A metal nanoparticle melts above the bulk melting point 3. A smaller quantum dot emits at a shorter wavelength
Answer: A
Correct answer: 1 and 3 only are correct
Statements 1 and 3 are correct: the ratio goes as \( 1/d \), and a smaller dot has a wider gap and so emits at a shorter wavelength. Statement 2 has the sign wrong - the melting point is depressed, not raised, because surface atoms are less tightly bound. Gold nanoparticles a few nanometres across melt hundreds of degrees below bulk gold.
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