Tijana Rajh (Serbian: TIјANA RAјK; born 1957) is an Serbian American materials scientist who is a professor and director of the Arizona State University School of Molecular Sciences. Her research considers the development of nanomaterials and materials for quantum technologies. She was awarded the Association for Women in Science Innovator Award in 2009, and named a Fellow of the American Association for the Advancement of Science in 2014.
Rajh was born in 1957, Belgrade, former Yugoslavia in a Serbian - Jewish family. Her father Zdenko Rajh (Reich, 1905-1990) was a publicist, lawyer, Auschwitz survivor and her mother Gordana Nikolic Rajh was a linguist. Despite being interested in Aristotle, Rajh became fascinated by better understanding the natural world. She completed her undergraduate and graduate degrees at the University of Belgrade, where she specialized in physical chemistry. After earning her doctorate, Rajh worked in solar energy research between National Renewable Energy Laboratory and the Boris Kidric Institute in Belgrade, where she worked on photo-electrochemistry and semiconductors.
Rajh worked at the Argonne National Laboratory, where she was eventually made an Argonne Distinguished Fellow. She worked on semiconducting nanocrystals for water splitting and electrochemistry. In particular, Rajh worked on the synthesis of the nanocrystals, and developed strategies to assemble them. She developed electron paramagnetic spectroscopy and other electron resonance techniques to understand spin effects during electron transfer. In 2009, she was awarded the Association for Women in Science Innovator Award, and she was named an American Association for the Advancement of Science Fellow in 2014.
Alongside her work on nanomaterials, Rajh developed quantum-enabled strategies for sensing. She showed that the high surface areas of metal-organic frameworks could be used to maximize sensitivity, permitting quantitive analysis using electron paramagnetic resonance. She has proposed that carbon nanotubes with highly confined electron spins could be used as qubits with record long coherence times.
In 2021, Rajh was named Director of the Arizona State University School of Molecular Sciences.