This chapter highlights some of the notable work done on the application of smart sensors. There has been a prominent rise in the use of smart sensors over the years, along with an estimated rise in the near future. Since energy harvesting is one of the popular sensing applications of recent years, the fabrication and implementation of nanogenerators is highlighted. The performance of these sensors is largely dependent on the type of raw materials processed to develop them. No part of this publication may be reproduced, stored in a retrieval system, subjected to any form of TDM or used for the training of any AI systems or similar technologies, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the publisher, or as expressly permitted by law or under terms agreed with the appropriate rights organization. Certain types of copying may be permitted in accordance with the terms of licences issued by the Copyright Licensing Agency, the Copyright Clearance Centre and other reproduction rights organizations.