Yes, we have an app for that!

Use the free BookMyne app to track your library account, search for books and place holds on your mobile device.  

BookMyne 4.0 for Android Devices:
https://play.google.com/store/apps/details?id=sirsidynix.bookmyne

BookMyne 4.0 for Apple Devices:
https://itunes.apple.com/us/app/bookmyne/id350625461