{"id":508612,"date":"2022-01-25T08:20:15","date_gmt":"2022-01-25T13:20:15","guid":{"rendered":"https:\/\/www.rochester.edu\/newscenter\/?p=508612"},"modified":"2023-09-18T17:27:31","modified_gmt":"2023-09-18T21:27:31","slug":"nanodiamonds-nitrogen-vacancy-centers-measure-temperature-508612","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/nanodiamonds-nitrogen-vacancy-centers-measure-temperature-508612\/","title":{"rendered":"Using nanodiamonds as sensors just got easier"},"content":{"rendered":"

Rochester researchers find new way to extract temperature from light emitted by a diamond defect.<\/h2>\n

For centuries people have placed the highest value on diamonds that are not only large but flawless.<\/p>\n

Scientists, however, have discovered exciting new applications for diamonds that are not only incredibly small but have a unique defect.<\/p>\n

In a recent paper in Applied Physics Letters<\/em><\/a>, researchers at the University of Rochester<\/a> describe a new way to measure temperature with these defects, called nitrogen vacancy centers, using the light they emit. The technique, adapted for single nanodiamonds by Andrea Pickel<\/a>, assistant professor of mechanical engineering<\/a>, and Dinesh Bommidi, a PhD student in her lab, allowed them to precisely measure, for the first time, the duration of these light emissions, or \u201cexcited state lifetimes,\u201d at a broad range of temperatures.<\/p>\n

The discovery earned the paper recognition as an American Institute of Physics \u201cScilight<\/a>,\u201d a showcase of what AIP considers the most interesting research across the physical sciences.<\/p>\n

The Rochester method gives researchers a less complicated, more accurate tool for using nitrogen vacancy centers to measure the temperature of nanoscale-sized materials. The approach is also safe for imaging sensitive nanoscale materials or biological tissues and could have applications in quantum information processing.<\/p>\n

For example, Pickel says, the technique could help define and measure the precise optimal temperatures needed to switch the resistivity of materials in nanoscale-sized phase change memory devices as part of the ongoing quest to store ever larger amounts of data in ever smaller devices.<\/p>\n

\u201cThese excited state lifetime measurements are really helpful for measuring temperature changes that take place not only over small length scales, but also on fast time scales,\u201d Pickel says. \u201cIt turns out these lifetimes are quite fast\u2014only about 25 to 30 nanoseconds at room temperature, and even faster at higher temperatures.\u201d<\/p>\n

\"Diptych
NANADIAMONDS ARE A SCIENTIST\u2019S BEST FRIEND?<\/strong> Left:<\/em> A transmission electron microscope image shows a single nanodiamond with a 70-nanometer diamond core on a carbon grid. Rochester researchers have developed a new way to use defects in diamonds called nitrogen vacancy centers to measure the temperature of the samples they are attached to with outstanding spatial and temporal resolution. Right:<\/em> An atomic force microscope (AFM) image shows nanodiamonds arranged in an \u201cR\u201d (for Rochester) pattern using AFM nanomanipulation. (Pickel Lab images)<\/figcaption><\/figure>\n

New technique offers multiple advantages over standard approach<\/strong><\/h3>\n

Nitrogen vacancy centers are often created by bombarding commercial diamonds with ions, then milling them down into the nanoscale diamond particles used by researchers. In a nitrogen vacancy center, one of the carbon atoms is replaced with a nitrogen atom, and the adjoining nitrogen atom is missing. \u201cIt turns out, these nitrogen vacancy centers are fluorescent, so if you send light in\u2014from a laser, for example\u2014you can also get light out of them,\u201d Pickel says.<\/p>\n

To date, most research groups have used a technique called optically detected magnetic resonance (ODMR) to measure temperature using nitrogen vacancy centers. However, the method has several drawbacks, Pickel says. OMDR requires placing a microwave antenna near the sample to do the measurements. That can be a complicated setup. The antenna can also cause heating that could harm sensitive materials or biological samples. Moreover, the microwave signal can be lost altogether at higher temperatures.<\/p>\n

Instead, Pickel and Bommidi adapted an existing technique called excited state lifetime thermometry and applied it to nitrogen vacancy centers in single nanodiamonds for the first time.<\/p>\n

The nanodiamonds, scattered on the surface of a material to be tested, are located using atomic force microscopy. The researchers developed a way to use the microscope probe tip to then move individual nanodiamonds to desired locations.<\/p>\n

\"Close-up
GIVE IT THE GREEN LIGHT:<\/strong>\u00a0Close-up of the laser system in Andrea Pickel\u2019s lab, located in Hopeman Hall. The researchers use green laser pulses to excite the nitrogen vacancy centers in the nanodiamonds in order to send the electrons into a higher energy state. (University of Rochester photo \/ J. Adam Fenster)<\/figcaption><\/figure>\n

\u201cIf you know there\u2019s a really critical location where you want to measure the temperature on a device or sample, this gives us a way to move the nanodiamond sensor to exactly that spot\u2014almost like using a putter in a little nanodiamond golf game,\u201d Pickel says.<\/p>\n

The researchers then excite the nitrogen vacancy centers with green laser pulses. This sends electrons into a higher energy state. When the laser shuts off and the electrons return to a normal state, photons are emitted. The duration of this emission is a precise indicator of temperature.<\/p>\n

Because the nanodiamonds are the same temperature as the material they are placed on, the readings are accurate for the material as well, Pickel says.<\/p>\n

\u201cWe are excited about this because it is all optical; we don\u2019t need to have a microwave antenna,\u201d Pickel says. \u201cAnd even when we increase the temperature, we retain access to our measurement signal, so we can make temperature measurements at pretty fast time scales. That\u2019s important at the nanoscale, because when you have really small samples, they can change temperatures really fast.\u201d<\/p>\n

\n

Read more<\/strong><\/h3>\n
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\"quantumResearchers confront major hurdle in quantum computing<\/strong><\/a><\/p>\n

In a series of papers, Rochester researchers report major strides in improving the transfer of information in quantum systems.<\/span><\/p>\n<\/div>\n

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\"ScientistPulsed lasers in liquids speed up the hunt for effective catalysts<\/strong><\/a><\/p>\n

Rochester researchers have documented the advantages of using the pulsed-laser-in-liquids technique over traditional wet laboratory methods.<\/span><\/p>\n<\/div>\n

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\"illustrationRochester researchers set \u2018ultrabroadband\u2019 record with entangled photons<\/strong><\/a><\/p>\n

Engineers have taken advantage of the quantum entanglement phenomenon to generate unprecedented bandwidth and brightness on chip-sized nanophotonic devices.<\/span><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Rochester researchers have found a new and improved way to extract temperature from the light emitted by a diamond defect.<\/p>\n","protected":false},"author":286,"featured_media":508652,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[23312,18632,37312,18572],"class_list":["post-508612","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-department-of-mechanical-engineering","tag-hajim-school-of-engineering-and-applied-sciences","tag-materials-science-program","tag-research-finding"],"acf":[],"yoast_head":"\nUsing nanodiamonds as sensors just got easier<\/title>\n<meta name=\"description\" content=\"University of Rochester researchers find new way to measure temperature from the light emitted by nitrogen vacancy centers in diamonds.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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