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I tested the Phantom 4 Pro’s Obstacle Sensing System by having it gather as much speed as it could and making it zoom straight toward the broadside of my barn. Each time, the drone stopped dead in its tracks approximately 5 to 10 feet away from what, for other drones, would have been a certain demise. It accomplished this forward and backward, and it even detected me while it was flying low and stopped before taking off my head. Unfortunately, the sideways collision-avoidance sensors work only in the Beginner and Tripod modes—here’s hoping that future models will employ all four in every mode.

Like the Mavic Pro, the Phantom 4 Pro can fly over 4 miles away, thanks to its OcuSync transmission system. DJI also claims a battery improvement in the Phantom 4 Pro, with a flight time of 30 minutes. PCMag was able to get 25 minutes out of the battery, a superb result for a high-performance drone. In contrast, I got 22 minutes from it and was able to fly only over 7,300 feet before I lost the transmission signal; perhaps this was due to the cold weather, but the Mavic Pro flew much farther.

The Phantom 4 Pro has all the same automated flight modes available in the Mavic Pro but adds Draw, which lets the pilot draw a path on the FPV screen; the drone then flies that route while keeping a uniform altitude. You control these modes via a smartphone or tablet mounted on the Phantom 4 Pro’s controller—but said controller is more comfortable and easier to use than the Mavic Pro’s. If you have the budget for more, the Phantom 4 Pro+ includes a remote controller with a built-in 5.5-inch 1080p screen twice as bright as the displays of conventional smart devices. It also does away with the need to bring your own smartphone or tablet.

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The DJI Spark is one of the cheapest and most basic models the company offers, and is an ideal beginner drone. Though it lacks the 4K recording, advanced AI, and extended flight time and range of the Mavic Pro , the Spark weighs and costs half as much and still retains important beginner-friendly features. The drone can take off, land, and return to home with the push of a button. It also has an intelligent enough positioning system to hold its location in the air. For a beginner who isn’t yet ready to learn how to pilot a drone and just wants to start taking photos and videos, they can begin by controlling the Spark from a smartphone or even gesture controls.

The Spark retains a good stabilization system, and is more than good enough for someone just starting to get into drone photography and videography. It offers speeds of up to 31 miles per hour, as well as 16 minutes of flight time. This is a drone that would be at home following a snowboarder down a hill, but passed over by professionals for options with a better camera.

The researchers finally hit upon a solution that was ingenious by its simplicity.Their golden idea: After the pores were filled with the self-assembled monolayer (SAM) material, they covered the SAMs in the pores with gold nanoparticles.These nanoparticles, big enough not to fall in between the self-assembled molecules, made contact with the molecules without destroying them or altering their properties.

“The nanoparticles auto-adjust to the size of the molecules,” says coauthor Marcel Mayor of the University of Basel. “This now looks so simple, and we did so much work to get there.”

The researchers created around 3,000 nanoporeson the wafer,each housing self-assembled molecules. When theytested the molecules’ response to applied voltages, they found that for same-size pores, the spread in responses was very small.Although the contact resistance for individual molecules in the pores may differ because of defects, there is an effective all-sample averaging caused by their SAM approach, explains Lörtscher.

Mayor is not sure whether the SAM devices will be able to compete with silicon devicesfordata storage or switching.Because the electrical properties of SAM molecules are affected by the presence of other molecules, they could be useful in sensing applications, he says.“There are many structures in which this behavior is known,” says Mayor. For example, the SAM moleculesare pH sensitive, and they rearrange their structure, or swell, when exposed to certainvaporsor solvents. “This is where all the interest from industry in these devices is coming from; they are interested in much more precise analytical devices,” says Mayor. Zhenan Bao , a materials scientist at Stanford University, agrees. “Contacting to single molecules reliably has always been a major challenge. It is impressive that they got very reproducible results and how beautifully the electrical conduction scaled with the length of the molecule. Their approach could be very promising for making molecular memory and circuits in the future,” she says.

However, Youngkyoo Kim , a researcher atKyungpook National University, in South Korea, expresses some reservations about the SAM devicesas sensors: “I feel thatthe present nanoparticle andself-assembly approach sounds good in termsof large-scalefabrication of electrical contacts in molecular devices but theperformance reproducibility and stabilitymay remaina big hurdle to overcome.I n thecase of the present device structure,both metal electrodes (including metal nanoparticles)and SAM layers need to bewellencapsulated for stable operation.”

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