A method of making a carbon nanotube reinforced solder cap. Carbon nanotube-solder (CNT-S) particles are transferred from a transfer substrate, having an adhesive layer, to a solder bump by using thermo compression bonding. The CNT-S particles are then reflowed to form a cap on the solder bump. The solder bump with the reflowed cap can then be joined to a bonding pad or another solder bump with a cap by placing the solder bump on the pad or other bump and reflowing at a temperature sufficient to reflow the cap(s).