Not familiar with creating QR codes? For QR code creation, I like qrstuff.com. You can link the code to a host of things including your contact information. You can also personalize the code with colors, etc. There are also some great Chrome extensions for QR creation and management. For scanning, I use the I-nigma app. Just make sure you have a system for organizing all those QR codes you scan.
Read this post for more info on organizing the QR codes you scan and other great conference tips!