yes they can be affected by temperature . Gold nanoparticle are made of gold though the melting point will be different of gold and gold nanoparticles

The LSPR peak is red shifted and broadened with increasing temperature. You can check the following papers:

1. Size and Temperature Dependence of the Plasmon Absorption of Colloidal Gold Nanoparticles, The Journal of Physical Chemistry B, 103 (21), 4212-4217,1999.

DOI: 10.1021/jp984796o

2. Temperature dependence of the surface plasmon resonance in gold nanoparticles,

Surface Science, 608, 275-281, 2013.

https://doi.org/10.1016/j.susc.2012.10.019.